It doesn't even go into full effect until a year after this term. It will be very difficult for it to "become entrenched" at that level until after that.A lot of that equation is going to depend on the "will of the people." Obamacare could face challenges of course, on a variety of levels (as it does now). But, it could also become very entrenched very quickly, and change the dynamics of what you're talking about.
Certainly, no President would use this kind of strategy on 3rd rails like Medicare, or SS. If Obamacare becomes something many either like to have, or depend on, it gets a lot trickier...