You are probably correct and he needs to be destroyed before then. A very well funded investigative effort needs to be undertaken by an existing conservative organization or a new, single purpose, group who will hire whatever resources are necessary to dog him, his family and close associates 24/7 and uncover his corrupt links to Ukraine and wherever else. He should not be able to walk the streets or sleep without a PI recording and reporting everything.
Maybe I am Pollyanna, but the only thing he will do if he runs third party is split the anti-Trump vote. He will hurt Democrats (who can’t seem to go left fast enough), more than Republicans. I don’t see traction with this.