I wonder if Ford could reprise Deckard for a BR sequel. His age wouldn't be as much as a problem if they moved it to the further future, and it rather fits his character of a world-weary detective. He doesn't even necessarily need to be the main character though.
Although, if he did age/was alive for more than 4 years, that would probably put an end to the whole "Deckard is a Replicant" thing.