America is not a business.
Businessmen make poor presidents.
One of the traits of being a businessman is you are a dictator of sorts. A benevolent one, but a dictator nonetheless. You set the rules of your business, you get to fire and hire at will, ect ect
In a Constitutional Republic, that doesn't work. Should Trump win, he's going to have a very difficult time accepting his limitations under the Constitution. His supporters will cheer him going around the separation of powers in the Constitution. That's part of the reason they are still campaigning against Cruz and conservatives. We will raise the most noise when he does that.
On FR, some posters stated he will end the careers of people like Ryan and McConnell if they don't go along with his agenda. Now, I know knowledge of civics and the Constitution isn't "in" on FR. But, despite their ignorance, Trump cannot "end" the careers of those two. It's up to the voters of their state and district to do such