Thanos Thanos:
Embargo their oil, cut off all their weapon supplies, and let the goddamn Iranians eat the lousy fuckers alive.

A good idea in theory, but they'll just go to the Chinese or even worse, the Russians for their security.
While North America doesn't rely on Saudi oil very much, many of our allies do and such a move could be even more destabilizing than dealing with the nutjobs in Riyadh.
If you think the oil industry is screwed now, imagine how bad it might be if Russia and Saudi Arabia colluded with each to control the market.