If there really is only one party, then you really can't blame Kristol for wanting to form a new one.
Maybe the impending nomination of a New York liberal like Trump means that is time for conserivatives to indeed time to form a new party.
At least, that would seem to be the case if we believe all those who claim there is just a "Uniparty" right now.
He did say “third party” versus “second”, take note.