There is a very easy way to insure people will go watch "Black Panther".
Make it an integral part of this quasi-"Infinity Gauntlet" saga they got going on.
Which is the exact same thing they did with "Guardians Of The Galaxy". People were talking about that movie would flop, I told cats a long ass time ago, as long as it contains Thanos and moves the major story arc, people would show up.
Not saying that's the only reason they did, but Marvel ain't stupid. They know 99.99% of the people watching "GoTG" have no idea who these people are, so they included major plot developments....first dialogue from Thanos, first mention of The Celestials, first time the various MacGuffins from the movies have been called the Infinity Stones, etc.
Make an Infinity Stone pop up in Wakanda, something like that. Or have an alien harboring a stone go there seeking asylum. Put Thanos in a couple scenes, boom. $100 mill opening weekend.
Fred.