They cannot write entitlement reforms. They cannot do anything because they are completely hostage to their "groups". All they can do is say "no no no!" to every new reform the Republicans propose.
One thing - the most important thing going away - that Obama has not even been talking about, much less "compromising" on, is entitlement reform. That is the major reason we are in irons. This is one issue where the POTUS must lead. He hasn't been.
I feel compelled to point out the inclusion of IPAB within Obamacare. It's not a reform in itself, but it does lay the groundwork for making reforms to Medicare politically possible, namely by sidelining congress. It's cost reduction proposals are implemented automatically, and can only be overturned by congress if a)congress proposes an alternative that contains Medicare cost by a comparable amount, or b)the senate can summon up 67 votes to veto the proposal.
Consider the fact that projected growth in Medicare's cost dwarfs all other deficit contributors
combined. The IPAB is the single greatest coup that entitlement reform could have possibly enjoyed... congress can let cuts/reforms to Medicare pas simply through inaction(or political maneuvering so they fall a few votes short of the needed 67 senators), without being held responsible for the cuts by AARP and senior voters.
The Republican response to IPAB is to label it a "death panel". I have a hard time taking them seriously as the party of entitlement reform, considering that.