The public domain aspect is an interesting angle of this I didn’t think about.
Ultimately, Disney is going to make a half a billion dollars or more off of this movie so it’s probably a pretty easy green light for them.
I also think your observation about 2D versus 3D animation might be true, and that there’s maybe just no appetite for 2D animation these days. But it’s too bad, I think we’re missing out. I know CGI will always be involved to some degree but I hope to see a more 2D style of CGI emerge. It’s such a unique (and arguably superior) style of story telling.
And yeah no one better touch the Back to the Future franchise. It’s perfect as is.