I think that Daesh would probably fracture if it grew too large, most likely between local Sultans, each veying for dominance. After all, if you're going to cling to a medieval system, you have to expect medieval problems.
Oil prices, yeah, it would be 1973 again, runs on the pumps, Putin falling off the Kremlin laughing, the Chinese panicking.
Worse case scenario if oil prices go too high it could collapse the fragile Chinese economy, although it would depend on when the scenario took place but right now China is in a pretty troubling place, something like this happening could push it over the edge.
Once the Chinese economy goes down, it takes the US one with it, which then takes Europe and Japan with it, and we're back in 2008 again. There's also the risk of an uprising within China by the die-hard communists looking to get rid of the Deng crowd while blaming them for all of Chinas economic woes (convieniently forgetting the dung heap that was the PRCs economy under Mao), and if that happens well all bets regarding local territorial claims around the PRC are off. I wouldn't put it past them to try something on Taiwan in order to keep the peoples minds off the dramatic shake-up that replacing the current PRC government would involve.
Of course, with the US shown as willing to use nuclear weapons, then the PRC would have to consider its options in regards to Taiwan, and the results of that would depend entirely on the mindset of those in charge.
In short, mapuc, you broke the planet, GG.