75. "there are a lot of issues that affect this" In response to In response to 66
1. The people making movies with predominately black casts - regardless of their own ethnicities - tend to aim for producing "populist" films - comedies and melodramas that pull box office or download sales but tend to be critically derided. While there's nothing wrong with that in general, if the aim is to increase the number of potential Oscar films starring black folks, that is a problem
2. The Oscars tend towards one of three types of films: big, important dramas with slightly showy acting parts and top-notch direction & technicals (e.g. "12 Years a Slave"), intimate dramas with showier acting parts and often more innovative writing (e.g. "American Hustle", "The Social Network"), and quirky art-house films with strong stylistic direction and filmmaking (e.g. "Birdman")
There are very, very few black films that fit into categories 2 and 3. Some come close ("Dear White People" is an example of #3).
3. Making a good film isn't enough to win an Oscar or even a nomination. The big studios spend millions of dollars on Oscar campaigns - hosting screenings, sending out screeners (often with extras and "goodies"), hosting dinners, and participating in the multitude of run-up awards to the Oscars. One of "Selma"'s issues was that the film wasn't done in time to enter many of the run-ups like the PGAs: it had just been shot over the summer and was barreling its way through post-production.
Really, investment is the #1 thing needed to solve much of this: investment in better quality production (giving filmmakers time and resources to craft better product), and marketing/promo muscle to help the film get noticed and win.