I’m fine with Mace Windu appearing in a show if it makes sense for the story. But do I want Windu: A Star Wars Story? No. I am and have always been against the idea that every character under the sun needs their own dedicated show or movie.
If they want to bring back Windu, and really focus on his character, that needs to be a book, comic, or even a game. Star Wars is in the position where the fans can have their cake and eat it too. We can have, through EU content, stories that build out the universe and expand on familiar characters, and through the mainstream live action stories, bold new ideas, that continue on the foundation the old films laid.
If everything gets the live action treatment, not only will things get stale, but Star Wars would also be severely misusing one the key things that makes it special: the ability to tell whatever story it wants across all genres and mediums in an already established and successful sandbox.