Maybe you're forgetting, but Mike Mearls was heavily involved in 4E, which was not open. Obviously Mike wasn't able to convince the right people at WotC that 4E should have been open. I give him the benefit of the doubt that he believes in open gaming, not because he has some book on his shelf, but because he spent a fair portion of his career with stuff he could only write because of the OGL. All we can hope for is that he has managed to get more clout since then.
Does 'The Cathedral and the Bazaar' have tips on how to talk to stubborn management in it?