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Bob: "All we can do if we did that is fail... no one has said yet "we're going to make this with you guys or with out." then we would said "your crazy, go a head" all anybody is going to say is "boy they fucked it up..."
when asked bout doing a Back To The Future 4:
Bob "Get out of here, No... look we've said so many times Indiana Jones 4 is the perfect reason we don't go back to that."
O&A: Will we see BBTF: The Animated series on DVD anytime soon?
Bob: "Universal keeps saying people want it, but have no plans to release it anytime soon... just get the bootleg"
Bob also stated that Steven Spielberg stole the nuclear explosion & Indy hiding in the refrigerator from the original Back To The Future script, where the time machine was a refrigerator and had to be near a nuclear testing site.
from
http://moviemiguel.blogspot.com/2009/02/bob-gale-confirms-back-to-future-4-or.html