Social security is a great example. Before social security, a large proportion of seniors were living in poverty. This proportion was lowered greatly. Now-a-days, people are living longer so it makes sense to increase the age of payment for social security. People should be working longer and should plan for it. This fact alone suggests that there is a growing well of productivity in the economy that is yet untapped.
In other words, no we can't maintain the status quo for social security. But if we abandon it entirely, a bunch of people will be pushed into poverty (a result that may end up hurting the economy a lot more in the long wrong). The solution is to raise the age of first payment and convince the boomers they need to work longer because they are getting the benefits of advanced medical care.
Cutting all social programs doesn't make any sense. It will just make the lower income earners suffer and inevitably lead to less growth because of the downward cycle of poverty (no money, no education, no opportunity).