I think POTUS Trump better reverse his thinking, chances are they lose their seats IF they vote yes on this damned bill!!!!
See, you can’t repeal completely and do nothing. They will lose big time.
They can’t get their own new bill because of 52 senate.
What Trump and Ryan trying to do is dismantle without requirement of 60 votes, no filibuster etc. Because of that they are doing CBO scoring etc.
For phase -2 , Price can remove regulation with this bill.
For phase -3 , they can add new bill for state line etc.
This is best option, otherwise Obamacare will remain intact. Best option is butcher it.