Avery Brooks being done with Hollywood is not by "his" choice. It's more like Hollywood is done with Avery, for whatever reason. Can't believe he got no acting assignments or offers after DS9, per IMDb. Yet, he apparently has been blacklisted for reasons yet to be revealed.
In an interview with Michael Dorn (Worf) on the Shuttlepod, he intimated that there was some sort of tension with Avery on the sets of DS9, which may have led to him being blacklisted with Hollywood execs, but he didn't bother to elaborate what those attitudes/incidents were.