So, what is the establishment? Old rich white males? Old white males? A leader who has been in power for a while? Serious question.
As to Trump, that is very irrelevant, which is obvious.
I don't think it is irrelevant in the context of just choosing someone that appears to be different in the hope it will be.
Many voted for him in the hope he would drain the swamp, fight for the underdog. Obviously, he has not done that.
The establishment in my view, is the traditional view of how things should be done.