I agree with
@Changa that there’s a nuanced difference in theme, but I don’t think it’s obnoxiously different - adding almost any modern ride system would have the effect of feeling ‘actually futuristic’. With that in mind, the aesthetic of Tron fits in with Tomorrowland as much as it reasonably could for any modern ride. It could be said that it helps balance the area out to feel less dated, whilst retaining elements of the original theme.
I do agree that Disney would be better off leaving alone it’s more popular IPs, or go back to investing in its more obscure ones. I think Tron fits into the latter ‘obscure IP’ category quite nicely.
Other examples of “welcome obscure IPs”, ignoring all controversies and strictly for illustration purposes only, would be Tower of Terror and Splash Mountain (the latter is obviously being re-themed for appropriate reasons - the Princess and the Frog overlay is also fairly obscure). It’s just not ‘obvious Disney stuff’ and it pays off.
Examples of IP-less themes that Disney should build more of:
Big Thunder Mountain
Space Mountain
Matterhorn
Spaceship Earth
Mission to Mars (or whatever it’s called)
Test Track
Carousel of Progress
Haunted Mansion
Jungle Cruise
Pirates of the Caribbean
Expedition Everest
Country Bears (this sort of show pains me but you get what I mean)
Countdown to Extinction (re-themed to Dinosaur, which I think nobody cares about / has seen)
A more obvious example of ‘doing it wrong’ is plastering Disney characters over Epcot fireworks, rather than maintaining a vanilla ‘worldwide’ theme. Not sure about the re-theme of Maelstrom (I thought the original ride was pretty pants as a dumb, sugar-craving kid).
There’s a balance to be struck, for sure.