From a long-term geopolitical view, I don’t see it as bad. For centuries, the Arabian Peninsula was more akin to the Middle Ages than the rest of the civilized world. Sand, camels, harems, tribes, etc.
Then came oil. Entire world strategies had to be devised to protect the oil. Lives and treasure were expended for that oil.
Their culture cannot, nor will it ever, support a Western-style government as long as their cult (some call it a religion) holds sway.
If the west becomes energy independent, the region will again revert to the Middle Ages, which is where they belong.
I see no downside.
They have been exporting their hotheads to us now, and they are already getting desperate on their declining oil supply. As they get more desperate, they will fund more terrorism to keep the heat off themselves.
Again, this doesn't have to be a bad thing. We just need to be prepared to counter the destabilizing effect.