Funny thing, of all the stuff I worry about, the US debt to GDP ratio is pretty much the bottom of the list :) - in terms of size it's just not that scary, sure the number sounds pretty scary, but the US economy is insanely big.

I'm far more worried about un-secured, insured private debt and what that would do when/if it blows up.

At some point we have to deal with wealth concentration because while money isn't a zero-sum game, the amount of money around doesn't grow anywhere near as quickly as it accumulates at the top.