I'd say it's far too soon to say that -- at the very least you know there will be a Black Panther 2 and there may be other projects down the line that we don't know about yet.
Marvel is on a tight schedule with their MCU world-building -- they didn't disappoint me with the changes to many of their comic lineups and because of that, I'm willing to give them the benefit of the doubt with regards to the MCU.
Like I said before BP came out: I'd rather them wait and do it right than rush something out there just to satisfy the audience, because if it's a bad movie then it only gives people more of an excuse to argue against more diversity in the entertainment medium.
What I'm going to do personally is go see the Miles Morales movie a couple of times since I'm sure I'll enjoy watching it on the big screen in 3D more than watching it at home -- I figure that's the best way to send a message to the studios about what kind of films they should be putting out.