I would feel differently about it being demolished if we were talking about Disneyland's version, as it's actually a fun, much more complex track, but since MK's brings nothing to the table I would be fine with it being replaced.
I was thinking the exact same thing. At Disneyland that whole section is integrated:
- Complex Autotopia track
- Monorail intermixed there, as a theme park ride, not just transportation
- Nemo (I think - was 20,000 Leagues)
- People Mover (R.I.P. - How Disney f'd this up nearly 20 years back and hasn't fixed it is beyond me)
- Skyway used to go through there, I think.
Anyway, over at Disneyland it's this wonder layering of a bunch of different rides. It's well landscaped. It really works and is really cool.
At MK it's just Florida's version of Autotopia in a much blander form. At one time, after Cars, I thought, "This would be the perfect ride to make into a Cars ride. Put new Cars-themed fiberglass shells on and the kids would like it (it's a retread, which I don't like, but I thought it would work). With what they did with Carsland out in DCA I don't think that would fly at all, now.
When it was built the interstate system was still fairly new and not even complete, yet. You could travel down I-10 across Florida and then be told, "I-10 ends.. Get off now and follow this other route," and you'd have to do that until I-10 began, again, 20 miles later. (I know, hard for the kids today to conceive of). Anyway, back during that time driving and the interstates and all that was exciting. Now it's part of everyday life and I don't think the kids really care too much about it. Besides, go-kart tracks abound which wasn't the case with the DL and WDW versions were built.
My thought would be, initially, tear it up and expand Tomorrowland. That thought would be quickly squashed by the realization that they have no ideas for Tomorrowland and would probably put an Frozen Olaf ride in there with him wearing a space helmet. Expand Fantasyland would work, too but there would need to be some kind of decent transition between the lands which Disney has been pretty good about.
At the end of the day, yes, it's a classic attraction but, no, I wouldn't miss it. I would be annoyed if they shut it down and then just left it to rot for 10-20 years, which they've been known to do.