I've been on the "new" version a handful of times now. Such a waste of a revamp. The original was so much better.
But Disney is never going to turn down sponsorship money, and if GM is happy with what's there, then they'll keep it. I don't know the terms of the contract, but they're not going to change it without money from the outside sponsor to change it. And at this point I don't know if they'd be able to pick up another sponsor willing to fork out the huge funds needed to give it a proper overhaul. Even this one was really pretty much done on the cheap, with almost all of the indoor theming being scrapped and replaced with an onboard video system that doesn't work well.