If the oil price rises significantly we wont need to worry about the LoCo's as they will be mopping up after the legacy carriers go bust.
its a question of who has what in the bank, or assets to sell.
RYR's model has been good for years but I agree the deliveries of new aircraft may be a problem as the selling of the older 737-800's has slowed to a trickle.
RYR will be here long after others have been consigned to the scrap heap.