The main challenge I think in the sector is over-saturation. The barrier to entry, especially for fly by night schools that skirt regulations is very low. It is difficult for the consumer to judge quality and there's some pretty overhyped marketing out there. Organizations like CIRR.org are cropping up to help with that, but the signal to noise ratio for consumers is very high right now.
Accelerated training isn't going away by any means, but I expect we'll see consolidation and more closings in the short term as the industry separates those with viable business models and outcomes from those that don't.