Ballsy move. I strongly suspect this could jeopardize the massive federal subsidies that keep Tesla afloat (and probably Solar City, too). $7.5K per car (which essentially amounts to a 10% per-unit discount out the door) times 84K cars is $630M.
I'd say the big danger for his stuff is SpaceX and NASA, and I don't think there's much risk there.
I wish our president could sacrifice something for what he believes is right much like Musk is, if what you say is true.