Agreed. This should have been addressed decades ago, and every year that goes buy it will get harder to deal with.
Me, I'd cut everything. Right now, when interest rates are relatively low, we're spending more to service the debt than we're spending on defense. This isn't a problem we can address with half measures.
The giant sacred cows are Defence (War) and Social Security. Could probably solve the deficit pretty quickly by getting money out of politics, especially defence contractor and AIPAC money.
That would require a significant political overhaul though.