I'd be floored if Disney didn't try, but nowadays social media would prevent a major corporation from doing something like this in secret. It would be a very big PR nightmare for Disney if they keep trying to change these laws every time they need to.
Also, these laws don't get passed overnight, so if they want to beat the January 1, 2024 deadline for Mickey Mouse, they really have to start acting now. The previous copyright extension in 1998 was nicknamed the "Sonny Bono Act," and he was a Republican. It'll be interesting to see if things are different now that the Democrats control both the House and the Senate for the next two years at least.