White males account for 70% of those writing for television and nearly 80% of those writing for feature film. Six multinational corporations own the television and movie business. Everyone in the industry works for Rupert Murdoch and Michael Eisner. It's long been established that minorities are at a disadvantage due to 5 main reasons:

They have no old boy network.
They need to initiate their own projects.
They need to raise their own money.
They make less for the same work.
Opportunities only increase if they are entrepreneurial.