It would make more sense to me that, if the next movie doesn't have the Black Panther in it anyway and is just a Wakanda movie, why not just do a Wakanda show and do a movie if they're ever ready to re-cast.
That being said, I know some people here aren't fans of Ryan Coogler, but he got Marvel Studios an Oscar nomination so it's a no-brainer.
I'm curious to see what direction they'll go in for a TV show.