Imaro, you're actually, in your own words the poster child for this. You state, "I honestly would have stopped playing D&D a while ago if it wasn't for Midnight and Iron Kingdoms giving me settings I really liked, the adventures by Paizo, True20 that kept me in d20 with it's adaptability and Mongoose who gave me the Lonewolf rpg". In other words, you already weren't buying WOTC material. From their point of view, it doesn't matter if you were still playing d20, because they're not getting anything out of that. You may as well be playing White Wolf or Paladium as far as they are concerned.
I think it's a case of realizing that the original OGL didn't do what they wanted it to do which was get companies to support D&D and sell PHB's, but rather created their own competition.