Personally I can no longer experience Autopia and I miss the enjoyment of the ride. My bad knees make it painful to get in and impossible to get out of the cars. However my 6'4" son still takes at least one spin on Autopia every visit to Disneyland. I would hate to see an end to it when he still enjoys it along with all those people in the long lines for it. But if it has to go I would like a new and improved version of it across the esplanade in Cars Land if only there was room for it. How fun it would be to drive in a replica of a Cars vehicle.
As for Tomorrow Land - I find it to be a completely outdated, infeasible idea in today's world. Back in the 50's technology wasn't making the leaps and bounds it's making today. The Disney Company would be hard pressed financially trying to keep a step ahead, let alone 5 steps ahead, of tomorrow's technology and today's people lining up to buy the next new innovation the minute it hits the shelves. When I think of Tomorrow Land I think of a land decades into the future and today's Tomorrow Land just doesn't have enough of it. I'm ready for a land that will take me outworld whether it be some Star Wars world, Avatar world or The Grid. However, I will always miss the submarines and Autopia.