I would love it if the party split. Reducing pressure of the far right would allow some movement of the Democrat party to the left. But I just don't believe it will happen. As much as team Trump wants to unburden themselves from the Republican party they can't afford to. They will lose too much power and influence over governance.
I, too, suspect that what they'll do is sit there threatening to split from the party to extract maximum concessions. Trump doesn't want to be president; he wants power and money without having to be accountable.