Disney is going to gt much more selective about which Marvle Movies they will fund. And Feige is finding out that after the string of MCU boc office disapointments, he won't get an almost automatic grenelight for his proposols the way he used to.
I think they will be a third Wakanda movie, but they are going to take some time with the screenplay to gry to correct the flaws with BP2.
I am one of those who think that the death of Boseman was a major blow to the MCU, they , after his huge sucess in BP, had him inked in as the next Tony Stark in terms of poulairty and being a tentpole for the whole franchise.