With only one carrier group in the Persian Gulf, I see Iran blocking off the Strait of Hormuz causing a massive oil crisis
Very doubtful that would ever happen, Iran has a bunch of outdated junk for a Navy.
Our USN is by far the most superior force in the world, if Iran was stupid enough to go up against our Navy, it would be like shooting fish in a barrel. They would be wiped out in a matter of days.
But that being said, I doubt our pathetic sad-sack of a CINC would do what is necessary to get things right.
But such an attack would cause the oil markets to sky-rocket, sending crude up to close $200/bl.
An attack would shut down the Strait for a while but the West would move in quickly to secure that region to get the flow of oil back to normal.
Now to the original question of the OP.
The next crisis will probably be the student loan bubble.
We have kids graduating with useless degrees owing tens if not hundreds of thousands of dollars.
The only jobs a lot of these kids can find is mixing paint at Home Depot or selling cars on some lemon lot.