The problem for Trump and the hard core right is they have no leverage over the more moderate members while the more moderate member's constituents do have the leverage at the polls. Guess who the more moderate members are listening to, yup their constituents, the ones they're were elected to represent............ Like it or not that's the way it works.
I've said it numerous times if preexisting conditions are reinstated and expanded Medicaid eliminated most likely the GOP's going to find itself out on the street begging for alms.
It's a perfect partisan conundrum. Obamacare does not do what it promised because it was passed without bipartisan support, and it was founded on an faulty assumption that insurance companies would compete to contain healthcare costs - and why would they possibly do that when they are guaranteed a profit regardless of what actual health care their policies provide?
To fix the law, we'd have to remove the faulty premise. However a minority of the gop wants to remove the taxes and what additional treatment is now offered. A maj of the gop doesn't want to remove the treatment but they don't have enough gop votes to remove the faulty premise AND keep the taxes and treatment.
So the only possible solution is a bipartisan compromise, but the gop has declared that to be not a possible option.