Here's my opinion on that: I admire QD's strongheaded direction doing what they're doing (interactive films or whatever), but trying to say "The whole industry must move into this direction" is false and arrogant. Most best-selling games including CRPGs that were always heavy on story never really required top-notch acting/mo-cap/dialogs to attract a huge customer base and sell well. The beauty of games is that there is no single procedure or direction that has to be taken. Due to it's interactive nature, a designer and story teller can take the narrative into any direction he/she wants to. David Cage hates that and therefor wants to convince publishers that he's better and smarter than anyone else and therefor should carry the financial burden.
Heavy Rain was a kinda nice and new-ish thing back then, but I don't think this trick will work twice. No decent gameplay, no longterm sales.
He could however try knocking doors at Film studios.