nobody was forced to do it and it only replaced time spent waiting in line so it was only a positive. Quite frankly IMHO the design center is one of the best things that modern WDI has done at Epcot and it really enhanced the attraction - the drawback was simply the lack of using the designs more during the ride where it could/should have interacted more.
Personally, I think using the car design and aesthetic of 2.0 with the physical effects of 1.0 would have made a killer Test Track.
Do we know for sure that the car design is going away?