They will indeed. But when was the last time the GOP ever repealed anything like this. Even from 2001 to 2007 when they had full control over the government they never repealed or scaled back a single entitlement.
Even if the GOP does win (I doubt they will), and it does mount a repeal effort, this will be vetoed by 0bama, and the GOP won't have enough votes to overcome this.
The democrats will run on the Mean Republicans taking away your free health Care,who do you think will win?