There are two very real barriers though. One is sore loser laws in place in many states, and the other (unless Trump signs on with a party already in place in enough states) filing deadlines to run as an independent.
Trump's best chance is to win the republican nomination. It is also the best outcome to re-establish partisanship, and stifle the "reach around politics" that is in place these days. The disgruntled RNC party leadership can bolt to the DEM party, which is where they fit better.
“chalk the vote”