I do have some reserverations on raising the age to 70. That may work for white collar workers, but people who have been working in manual labor or other physically demanding jobs would be hurt. You can raise the retirement age so high that no one will collect benefits.
Everthing I have read about the problems with SS make it clear that it is fairly easy to solve. I would like to see us privatize the program and keep a small defined benefit program for survivor and disability benefits. Personal accounts are a win-win solution for everyone. They would have to be phased in and the transition costs budgeted for on a one time basis. SS is a Ponzi scheme.