Despite the disliking of Democratic establishment, Bernie appears to be the front runner to win the nomination. If he does so, he should be able to defeat Trump as he should get the youngsters behind him.
But the bigger question is whether he will be able to stand up to the Establishment if he makes it to the Office. He has been consistent in opposing them but will he be able to put up to the enormous pressure. The moment he makes to Office, the establishment will try to get him to another war. If he can't stand up to that, it will be all over from that point.