Banning Trump would be one way to get rid of him—Use every resorce they have—and its big—to turn Trump into a clown, a fool, an egotist, bigot. (Hey it worked on the Tea Party). But he could counter with his savy. Yes, we live in strange times. He may well set up a 3rd Party—and become another footnote in History. Or he could be worse—a real thorn in the side of the GOPe. Run as an Independent with Sarah Palin as his VP.
He could then offer Ted the job as AG if he dropped out and supported Trump.
Then Rubio could run as Hilliarly's Veep.