I guess the genius politicians will have to figure something out.
The solution, of course, is to completely reform the system; remove it from government control and turn it over to several competing private investment brokers who would bid for a piece of the action. Their continued participation would depend entirely on the results they achieve, calculated over a reasonable period of time.
The new system would begin with, say, 10% of the current monthly SS pile going directly into diversified investment portfolios. A schedule of adding 5% every 5 years would force the continued divestment of the government from the program. I believe it wouldn't be long before surpluses more than covered the depleted SS tax intake, and government could return to being fat and happy. (Note: The above numbers are pulled out of thin air and are for illustrative purposes only. Hopefully they help convey the general idea.)
Meanwhile, old folks (heck, make it everybody 40 and older) would be assured and guaranteed that nothing would change for them due to the switch to the new system no matter what happened, etc., etc. Young people, most of whom believe SS will never be there for them anyway, could now be told of a new system that will greatly improve their chances of getting that old age pension they thought they'd never see.
By the way, I am as disgusted as every other conservative that government is in any way involved in old age pensions ("social security") in the first place, but realville is that it's here to stay.
It should be made voluntary yesterday. Theft is theft.