A complete repeal of Obamacare is not only going to be extremely hard to do, it would be a bad move politically. The country is split on it at best for the Republicans, and if they win in 2012 their mandate is going to be to fix the economy/lower the deficit. Repealing Obamacare does neither and too much focus on it will lead to a very good election for the Democrats in 2014. Actually that might happen regardless of what happens in a Romney term.....
Obamacare's chance of surviving in its present form is 0% no matter who is elected. Thank you.
So just raise the penalty or allow for higher deductible plans with lower premiums to reel in the late 20's/early 30's crowd. Not a hard fix. Of course a more comprehensive plan based on the Wyden plan would be preferable, but unlikely to happen.