The problem with setting a date to dissolve Social Security is that no matter what date you set, the same situation exists. People will have contributed a lot of money, and they will be told they will get nothing in return. The only way to resolve that injustice is to give them back their money. That would be prohibitively expensive, and for that reason I would not personally support it.
The evil of Social Security is that now we've got it, we can't get rid of it without causing severe pain to alot of people, including taxpayers in general who are not even in Social Security at all.
Are you under the impression that you have any legal right to the money you've contributed to Social Security? If so you're mistaken, a Supreme Court case whose name escapes me settled that years ago.