Should there be more historical fiction in film? Lincoln will certainly inspire more biopics about other presidents (didn't FDR have a film this year, too?). A Washington film could be epic, but a Jefferson movie about his legacy would be as powerful as Lincoln was.
As for Django, I can't see how other filmmakers will follow up on Reg/Q's creativity. The combination of blaxploitation/western is cool, but I'd like to see more like it developed through HBO or PBS.
Maybe the Wayans will do a compilation historical film spoof that attracts a PG-13 audience while raising important questions and new interpretations subtly between the slapstick jokes ... retrospective on films like Color Adjustment, Down in the Delta, Harlem Nights with elements of Hangover/Bridesmaids? Could be a blockbuster...