Nothing? Revolt? If nothing, why have elections? Just say that we'll be a one-party oligarchy ran by the Democratic Party like the Communist Party has in China. If Trump is unjustly removed and we do nothing, our democracy is over.
If he is found guilty of the charges that he is accused of then he can be justly removed from office. If he is found guilty of those charges and he is tried by the Senate and found Guilty then he WILL be justly removed from office. If it's found that there is not enough evidence for a conviction then the senate has two options. They can find him not guilty of all charges or they can censor him. (Yan, you rumpsters, I know I mispelled it so knock yourselves out).
The Senate HAS to follow the law. And since Impeachment is Political and not Lawful, chances are good that they won't remove him from office. But if things go south they just might. Depends just how much of a backbone the Republicans grow between now and then.
And no matter what happens, the United States will endure. The Old Girl has been through much worse.