I think you've nailed it. He isn't happy that Twitter has no boundaries or walls for him to build and maintain. It appears that in his mind, Twitter should go away since it doesn't serve his specific needs, never mind the 200 million+ other users who are happy with how it works.

I don't care for Twitter myself, but I'm not going to call for its demise just because I don't get much out of it. Obviously it has a prominent place as a major social media engine, and that's just fine. But then, it's not all about me.