Funny that he'd lay the blame on entitlements when it could just as easily be laid on out-of-control military spending with the Terrorism boogeyman cracking the whip. Why, because neither the Republicans nor Democrats can keep their entitled noses out of other countries' (or their own citizens') business. There's no way to reverse that and the politics are truly awful.
The bigger problem is that the American people have collectively decided that debt simply doesn't matter. Congress and the President pass budgets with eye-popping deficits. The Tea Party and its calls for fiscal restraint are as good as dead. Sanders, Warren, and the left wing of the Democratic party are on the ascendency and will do everything they can to implement programs with high price tags. Republicans will block any attempt to raise taxes to pay for it all. The Federal Reserve has decided to pull the plug on quantitative tightening, making it that much easier for Congress to balloon the national debt.
Greenspan bears major responsibility for this mess. His complicity in letting asset bubbles inflate well beyond control, and his rush to paper over the resulting mess leads us where we are today. A financial house of mirrors where bullshit passes for money and only the poor get hurt for their financial stupidity.