I think the building is fine, it's how it's being used that's the problem.
having a flynns arcade next to the building would be super rad, esp if it was 80s themed full of arcade machines from that era
At that point it might have to be done under the umbrella of the Tomorrowland Historical Society . . . an 80's Arcade isn't exactly the definition of "Tomorrow".
That said, bits like this really show how under-baked the Concept of the TRON Coaster really was. It's very nearly just a Coaster with TRON-styled decor around it. The entire conceit from the film of what the Game Grid is and how you end up there in the first place is basically ignored. How is it we just walk up to the Game Grid out in open space? And what the heck is that weird outdoor loop relative to the game?
Meanwhile, they COULD have designed a ride that was hidden behind a Flynn's Arcade facade, with Arcade Games lining the queue (maybe they're playable?), and a stellar preshow room where guests get "uploaded" into the game and see the store-room of the Arcade around them transform into a holding cell in The Grid. And THEN you go and get on the coaster.
Wrap the whole thing up with a dazzling effect where the lightcycles "break through" back into the real world and let them unload there, making sense of how you got out of the Game. Let guests wander out through a gift shop adjoining Flynn's Arcade, featuring vintage-style t-shirts and souvenirs.
Doesn't suit Tomorrowland much more (though, does it really suit it that much worse?) - that kind of take would work better at Hollywood Studios, I think. But it would have given you an actual, complete, perhaps decently comprehensive and comprehensible TRON experience. Instead of a 59 second coaster with minimal set up and perhaps even less payoff.