I completely see why they are doing it, I even believe that they really are not concerned about the third party market as it currently exists they want to nail down the IP in the VTT and computer/net application space and in the broader performance space. The mistake was in my opinion, gunning for the current open content. If they closed the licence and issued OneD&D on a 5.2 SRD there would be some smoke, heat and a little fire but I think it would have died down.I am finding myself in a really odd situation: the more this goes on, the more I start to see Hasbro/WotC's point in doing it!
The sad bit is that the OGL proved to be quixotic at the first real test. No one defended their rights under it but everyone ran for the exits.