Just hypothetically, I’d imagine the reaction would be a little more suave.
Trump’s all naked ego and greed, and the rich and powerful can play that tune. He’s not an idealist, so his populist convictions are only as relevant as they serve his massive self-image, and that can be manipulated. His main flaw in the eyes of the harshest Right Wing is that he’s NOT a starry-eyed true believer. He’s a con-man who is only loyal to his own delusions. He’s not going to be anyone’s sacrifice and he’s happy to pretend to believe whatever is expedient at the time. While they’re not happy losing out on the loyalist elements that someone like Carson or Jeb or Rubio or Jindal would bring, they’ll adapt. Trump is easily led. Which is a bonus, and a liability (because popular opinion could lead him into doing something dumb).
Sanders IS an idealist, which is part of why the Establishment Left is deeply uncomfortable. They’re used to moral compromise for the sake of profit, and he makes them look bad. However, he is blazing new trails, and that brings with it the potential to control and shape this new world. If they can make themselves useful to him, it won’t matter if he overturns Citizens United or taxes stock trades or whatever (that’s not something he practically has much authority to do, after all) - they can all make bank by being the connection between his idealistic new world and the place where the cattle must get ground to make the beef. In the short term, at least, it’ll be easy to convince the rich and powerful that donating to a “moderate Democrat” who can tamp down the Socialism and neuter the new laws is a better option than donating to any sort of Republican nutjob.
Which is just really to say that Trump is a loose cannon that can be pointed by someone and that Sanders probably isn’t the second coming of Che.
But elections are about hopes and dreams, not about reasonable expectations. 
