Middle-O-Road: The current unfunded liability in Social Security is probably north of $10 trillion, so the $2 trillion "transition cost" is a very small price to pay for fixing this problem once and for all. The Democrats focus on the $2 trillion transition cost while begging "don't look at that $10 trillion problem over there... maybe it will go away! Maybe there will be a tsunami that will wipe out 20-30MM future beneficiaries and Social Security will have another 40 years of ponzi-scheme viability!" That's the Paul Krugman view of this.
Why don't you visit the Cato or Independent Women's Forum or Heritage Websites and look at some of the very good papers that have been done on Social Security. Or ask your Congressman how the city of Galveston, TX, workers are doing having opted out of Social Security many years ago? Answer: they're loving their private plan... just as Congressmen love their 401K private plan. And those plans aren't going bankrupt.
You're assuming that the $2 Trillion price tag won't balloon out of control once Congress gets their hands on this issue. It would turn into a pork fest. No thank you. I'd like to see some alternatives before I bite.
Also, if we can't afford the $10 Trillion, how do we afford the $2 Trillion?
As to 'fix the problem for good' - well, I've heard that one before.