Glad to see someone agree with me. Sorta. :)
But:
Why wouldn’t you have the same problems and fights to begin with? Same disagreement on candidates, etc. Except you have to build a whole new apparatus in the meantime.
Fights within a party are okay, just as long as there aren't saboteurs working to take advantage of the disagreements and there isn't a Romney-type waiting in the wings.
It all depends on what would happen faster.
Good supporters moving toward a third party or saboteurs and the media moving in to destroy the third party.