Now that we've solved Daesh, we have to look at the wider conflict. That is between Saudi Arabia and Iran.
For many years, the two have been waging a shadow war across the Middle East. It's being fought in Iraq and Syria, in Israel and Gaza, and in Yemen and Oman.
I am concerned with the passing of the Saudi king. He was largely opposed to escalating the conflict. But he also had little chance to respond to Iran's major victory in Yemen.
It is quite the coup for Iran in Sanaa, but it could push the Saudi monarchy in a number of directions.
They've been keeping oil prices low to hurt Iran, and that could well end far more suddenly than anticipated (the new king will invariably raise prices) if the Saudis choose to send their army--camped on the Saudi-Yemen border--to put their man back in power. This has the profitable side effect of seriously hurting Russia, which is just as dependent on oil revenues as any Middle Eastern state.
Alternatively, it could push the Saudis closer to Al Qaeda. They've had a working relationship for some time, at least since the early 2000s. And the Saudis have been funding Al Qaeda in Yemen for some time as part-time auxiliaries for their puppet government.
A major concern I have is that Obama, desperate for a foreign policy victory, might take an opportunity. And Obama is very desperate: he's consistently losing at home, his own party is against him, can't do anything right overseas, has been dismantling American alliances and empowering both Russia and Daesh. His last two years will be spent searching for a legacy which doesn't include "worst President since Buchanan". And he'll have the 101st walking a beat in Riyadh.