This one bugs me even more now than it used to, because they positioned Tron so awkwardly (in terms of vantage points both inside and outside the park)...and glancing at the map, you'd assume they did it just to preserve this smelly, loud, unpleasant waste of space.
Autopia in Anaheim has historical value, and it got woven into the 1959 submarine/monorail area in an elegant and inextricable way (you probably couldn't stack anything else on top of the Nemo show buildings anyway, so this one exemplifies creative use of limited space).
Autopia in Paris is tastefully tucked away behind Main Street (but I wouldn't mind if they wanted to tear it down and put something better there instead; that park can use a couple more rides, once they reach a stopping point with the Studios transformation next door).
Raceway in Tokyo got bulldozed in favor of Beauty and the Beast, which I haven't ridden yet but have to assume is an improvement.
Autopia in Hong Kong will be replaced by some Marvel thing (more web-throwing?)...we'll see if that's better or a wash.
Speedway in Orlando is just a blight. And it's in an annoyingly conspicuous/in-the-way spot, a sin it shares with my next choice for removal, Magic Carpets.