UN-Possible! If that did happen, the state of ‘tie’ would not last very long. We went through that back in 2000. This was when the parties got along together far better than now. And still, it was a full out power battle. People want this to be OVER and resolved on or near Election Day.
Then the election goes to the House.
If it was a tie, the Clintonistas would bribe or blackmail one of the Trump electors into voting for her. Said elector would live a very comfortable life in some distant country under an assumed name.
Well then, "people" can go screw. That's not our system.