adding so much more debt at a time when we need to be taking near-fascistic measures to be reducing it, likely will result in the US repudiating the dollar by 2025. its over. no nation can issue this much debt and survive. expect a global ultra-depression when this implodes, punctuated by a major war.
While entitlements are definitely a long run problem, I think we have a more immediate one: the willingness of other countries to keep trusting US govt debt. It doesn't matter what our debt/GDP ratio is if our creditors think we'll debase our way out of what we owe. We should know the answer to that one within a year.
We live in interesting times.