I was under the impression that Dinoland and Beastly Kingdom were both intended to have been included in AK, each occupying different spaces (Dinoland where it is now and BK over at the place Avatar is supposed to go). Beastly Kingdom just happened to have been one of the park's many cuts, part of the park budget cuts that began under Eisner. And had BK been built in some form with said cuts, it likely would have been unrecognizable from its intended form (the rest of the park's rides would have been mutilated further as well to compensate). Again though, far from the only (some may argue not even the worst) cut to happen to the park. Tiger River (a full on lengthy E Ticket boat safari through Asian animal habitats) for example was sliced down to Kali, a very short off the shelf rapids ride. Dinoland was also slashed to pieces. I don't know what all else was cut from the park, but there was probably more. I might have been more ok with a potential delay of BK, had they compensated by going all the way with the other rides instead- building a fully realized Tiger River along with a non-slashed Dinoland (along with an EPCOT-caliber ride instead of Dinorama). And had leadership not gone down the crapper in this era and forgotten the concept of a "phase 2", we still could have possibly seen BK soon after opening anyways instead of seeing it slashed outright. What sucks the most is that they didn't even reroute ANY of the money into improving the rest of the park, the rest of the rides were even further mutilated even beyond their own original forms.
In my opinion, Kilimanjaro Safari is the only ride at Animal Kingdom that actually feels "complete", fully satisfying and worthy of what one expects of Disney. And I concede that it too may have been cut down considerably from its original form (I don't know about the history of this one). But for what it is (again not knowing its history or whether cuts were made), I don't get off with a nagging suspicion that it wasn't finished, I feel satisfied and don't leave it thinking "well that could have been much better". I do however get that feeling from all the other rides at AK, and this was even before I started researching Animal Kingdom's history and found out about all the budget cuts and ride downgrades. The Safari though to me is a fantastic experience and IMO lives up to classic Disney standards of quality. I will also say that as far as WDW rides go, it's kind of the last of its kind (as of now anyways, we'll have to see whether Disney World ever finds its way out of the slump it has been in for decades now). No WDW ride built since has given me the same feeling of satisfaction and made me feel like it lived up to Disney standards of quality.
I have nothing whatsoever against the idea of Dinoland because honestly a well done prehistoric land is a fantastic idea in my book with great potential. It's the execution where it falters. Like the rest of the park, it got a heavily value engineered version of what could have been a truly outstanding land. Besides the cutting of the Excavator coaster (which while it didn't look groundbreaking could still have been a nice addition), the concept form of Countdown to Extinction portrayed a much longer ride that even included an outside segment. I believe Martin's tribute for the ride goes somewhat into detail about it's concept form. They cut the outside and opted to clone the Indiana Jones track layout instead of a more customized one apparently. They further engineered what remained by not completing indoor show scenes (apparently so much is in darkness due to there being a lot of incomplete or not constructed show scenes that were supposed to go there). I do enjoy the current ride to some extent, but had they gone full throttle with the original concept then it would have been a truly amazing ride that people wouldn't dismissively compare to Indy. Hell, even filling in the dark empty parts within its current building space would go a long way to improving the ride and public opinion of it.
Dinorama needs to go though and replaced by an actually good ride (and one that looks good externally). Hideous thing that compromises an otherwise gorgeous park. And yes I am aware of the backstory they cobbled together for it, still not a fan. Thankfully it sounds like the entire thing could be demolished and removed in a ridiculously short time, not too unlike an actual roadside carnival. Of course it will never be done at this rate, but lets just play pretend for one moment and Disney hypothetically gets new leadership that aren't complete morons and are willing to grow the parks organically. To me it's a no brainer to build in its place a multi-level POTC-style boat ride (which has the added benefit of good capacity and efficiency) through various eras of prehistoric extinct animals. Classic Disney style, whole shebang of fantastic showscenes and lots of animatronic creatures. Give it a Smithsonian Castle theme to the facade and queue. They can even rename the land Prehistoria to celebrate all extinct animals. After that is finished and there's a new decent ride to compensate, Dinosaur should be taken offline for a decent lengthy refurb period, filling out the dark empty spaces with new show scenes (I don't see it being even a remote possibility even with more competent leadership, but ideally expand it to the original concept form with the outdoor portion). They can also add the Excavator for an added new attraction (further increasing capacity of the park) if they like. Those changes (along with appropriate thematic alterations to fit with the new rides and ideas) would IMO make this one hell of a great land. It would also pave the way for improving the park elsewhere, including taking other rides offline for necessary refurbishment and improvement (there would be a buffer of other rides to help compensate for the downtime).