The only way Black Panther doesn't get a sequel is if a natural disaster wipes out Hollywood. The only question is who will return; will Cogler be up for another round, or will he want to do a smaller, more personal project after working in the Marvel machine for the past three years?
Black Panther deserves a trilogy, as does Dr. Strange and Ant-man. I also hope Captain Marvel gets a trilogy as well. I'm also really, really hoping for a Thor 4 where Taika returns. I'm also conflicted about a Cap 4: I want another Captain America movie, but I think that him and/or Iron Man are going to bite the dust in Infinity War.