Here are some of Tony Baxter's comments about the creation of The Indiana Jones Adventure for Disneyland:
"I think the worst type of IP attraction is where you slap a name on something that's totally generic. I won't say other parks by name, but they'll go out of their way to buy the rights, and it's basically a billboard out in front of something they've bought from a steel vendor. To me, that doesn't do anything. It's got to deliver the emotional expectations if you're labeling it with IP.
Indiana Jones is a good example, because everything about that ride, we pretty much developed here. I actually have a slide that I put in a show, where I bring up the Indiana Jones Adventure and the perfect script and everything, and then I show 'Kentucky Buck Adventure' and a similar script, and I say, 'okay, tell me the emotions that are going through you as you see both of these.' And you get 'authentic,' 'correct,' and everything about it, and then 'rip-off' and all that, and I say, why would you avoid the relationship with Lucas and the payments and all that when what it 'buys' you are all these negative feelings? I'm sure we could do that, but why? Why not say that Disney's got the ultimate one?
Star Wars is the ultimate space adventure. Indiana Jones is the ultimate. If we want to do anything in those worlds, you either are inauthentic or you're authentic."
Source:
https://www.themeparkinsider.com/flume/201311/3782/
At this point, eliminating The Twilight Zone from The Tower of Terror in favor of a "Twilight-Zone-ish" original alternative would just make the ride feel like a knockoff of its own successes. It's already great and people love it as-is. Just let it be.