Perhaps the only ones with worthwhile answers are Godard, Fassbinder and Antonioni, yet Spielberg's was rather revealing of his own personality and the modern state of moviemaking in Hollywood (just scratch that idealistic notion of "films for everyone" and realize what it really means - films for everyone to buy).
a unique look into the minds of parts of the French New Wave, New German Cinema & New Hollywood. fascinating.
Brent, it's available on the Wim Wenders Collection, Vol. 2 released by Anchor Bay. I think you can rent it on netflix, too. It really is fascinating stuff...Herzog's interview was a highlight for me, not only because of his initially funny response (you'll know when you see it) and also because there is a lot of truth to his answer.