I don't understand this major push by some fans to have BP be used as vehicle for other major characters. I sometimes feel people get too caught up in the shared universe aspect of the MCU and forget the fact that even though these characters exist in the same sandbox they are also independent products that deserve to be treated as such. It also feels reductive to the characters that get suggested like Doctor Doom, who should be introduced in a Fantastic Four movie, who themselves deserve a solo outing without taking up a lot of space in another character's film beforehand.
Same with Namor who arguably should be where Aquaman is now, but Marvel doesn't treat him right. That being said I don't feel it's incumbent on the BP mythos to uplift him (or any other character for that matter) to the extent that some people seem to be suggesting. A end credits scene or quick cameo is cool though.
Some of the comments I've read online make me think people want a stealth (insert character/team name here) movie with Black Panther slapped on the title, which is unfortunate. Could be me overstating things, but I really hope Marvel don't fall into the rabbit hole of trying to please people who are more interested in seeing their favorite underutilized character than seeing a film about the character whose name is in the title.
It goes without saying that T'Challa doesn't have the deepest bench of rogues to use on the big screen, but I trust Coogler and company to do the necessary uplifting to make a solid threat that's largely within his mythos. A mashup of Tetu and Achebe or a revamped King Cadaver can be just as impressive as Doom if people are willing to let them stand on their own two feet and the right adjustments are made. I'd prefer to see that, at least in part because it means potentially stronger rogues in the comics.
Granted most moviegoers don't care about the effects these movies have on the comics side of things so it's really all up to the vision of the guys making the movie, who I'm sure will tell a strong story either way