Yeah, there would likely be a real net-positive to corporations trying to damage each other's credibilities via security disclosures. (No sarcasm - I believe it).
I'm with GP on that we need more programs like project zero.
NSA guy #2: "Sure, let's release our Google zero day!"
#1: "Oh, but didn't we spend millions on that?"
#2: "Yeah, but it'll really screw up Google!"
#1: "Okay, do it."
Google: "Oh my, thanks for pointing out that exploit. We're so glad the NSA is getting back to its mandate to alert American companies and organizations when it had identified security holes. And....fixed. Let us know if you find any more!"