I don't know if this is the best thread, but it does pop into my head a bit more.
If Disney wants to do a cheap and easy change for the 50th of WDW, why don't they just reconvert the entire RNRC area/coaster, into a form of Cars based attraction/area? I would imagine they wouldn't have to do much, outside of a few things of note; and it could be an easy way to get people over to that section of the park.