The problem is he needs Twitter as much as Twitter needs him. Lots of people have talked about getting his base over to some other app that will allow him to say whatever, but it just hasn't worked.
Curious, has the President really tried that hard? I can't imagine that he would fail if he made a clean break from Twitter when switching. Love him or hate him, he in a position to command endless press through whichever platform he chooses.
Interesting business case. I think yes, he single handed Ky could jump start a new social network. Millions of people would follow him just to argue about his posts.