The original TT sucked, just as the current one does. It wasn't educational in any meaningful way. "Heres how ABS works" - "Heres how we test suspensions" - "Heres how we test for acid rain". Its not teaching, its show and tell.
Test Track's 'thing' is that it goes 64mph. Thats not even fast - both for a ride and for real life. Not fun. Boring. To be clear - you can have a fun attraction at a lot less than 64mph. Space and Thunder, for instance. But you're in a car. 64 in a car isn't fun. Its commuting.
Yes, I agree that RSR//Carsland doesn't fit the FW theme. Which is why I said it isn't a good spot. But that doesn't negate the fact that RSR is a vastly superior attraction to both versions of Test Track. And its also not going to be Future World for much longer. RSR doesn't fit into any of the new 'Worlds' either, but hanging onto the idea of FW isn't going to help anyone in the long term.
Anyway - my point was that if you're simply replacing an attraction with another, TT to RSR is a clear upgrade. It shouldn't cause nausea because you're improving the ride quality by every measure. Cohesiveness of the theming of the area is a separate issue.