In my mind, the buses are not attractions. They are a utility part of Walt Disney World. It's hard to theme a bus. Color designs, sure. My apologies to those that think those Japan buses are wonderful, but I think they are ugly, gaudy and even use bus chassis from the early 50's. WDW may not have those (thankfully) but really all they need to do is identify themselves with where you are. This new design is not only attractive but it has a built in safety factor which I find commendable. The buses take you to the entertainment, they aren't the entertainment. They are smelly, bulky objects designed to transport you to the entertainment, nothing else.
There was a time when they were warm and fuzzy and that was pretty much when WDW was new. Traffic was light and problems were few. Today, especially in Central Florida it is far more hospitable to know that the driver is paying attention to the task then cutting jokes. Sorry, but some things are just meant to be functional. What other modes of transportation on WDW property, other then the Jungle Cruise and Safari, are there that you expect the driver to engage in entertaining the guests.
If the buses are clean internally and externally, are pleasant to the eye and are unique to where you are, they have accomplished their mission.
As with many other things, the argument will be that they are not what they used to be. Well, neither are you, I'll bet. I know I'm not! Things change with time for many reasons. Maybe technological changes with the times, maybe priorities change not only from management but also from the public. Do you think that Disney would have spent the money they did to put those pain in the butt doors on the trams, if the public hadn't changed to the point that Disney had to protect itself from stupid, greedy people?
It's easy to blame Disney for changes that are probably outsider influenced. No new attractions? Gotcha and I agree! Disney needs to get it's act together in that area, but that doesn't mean that every other none related ideas are bad, just if we were to prioritize it, we wouldn't put it first.