That made me laugh. 
Maybe it's because I watched "What's Love Got To Do With It" so much as a child. I could pretty much recite that movie by heart.
But on the subject of black movies following the same trend, let me ask this -- Honestly, if "Inception" or "Black Swan" featured an all-black cast, would they be marketable? Do we as African-Americans predominantly relate to stuff like that?
You realize I own 'Inception', right? A good movie is a good movie. A good movie with a great cast is a great movie. Color has little to do with it.
The problem, again, as LaRue has pointed out is that any time an all-Black cast is involved the theme is usually cultural as opposed to universal.
I can't see Spike Lee making something like 'Inception' starring himself, Denzel and Giancarlo Esposito. *kanyeshrug*