Perhaps. But what will Trump accomplish in the end? What's the endgame? He's not going to be elected. There aren't enough folks out there to eat the red meat he's throwing out. Sure, he'll rally some hard-core anti-establishment groups but he's not going to win the nomination, much less the election. He has to know this.
You're most likely correct, however, if you recall, much the same was said about others who have won (Reagan wasn't electable according to his RINO critics).
I like two things about him. He doesn't fear the media, and he doesn't fear left wing critics in power. That puts him in a different class than most RINOs. One other guy who shows no fear, and is electable (IMO) is Scott Walker. He knows how to deal with the media and doesn't fear taking on the left.