It seems simple: the ULCC business model views airline seats as a commodity and nothing more, for better or worse. If investing in the infrastructure needed in order to prevent these meltdowns from ever happening creates a CASM too high for the business model, these meltdowns will just become an unfortunate and accepted reality. What remains to be seen is how the market will respond to these types of events - if consumers in the aggregate are willing to accept them once or twice a year in order to (usually) make it to their destination on the expected day at a rock bottom price, or if they consider the risk just too high and are unwilling to take a chance even at a low price.

My guess is that no significant changes will be made, at least not any that substantially raise costs, and they will effectively hedge their bets that the next time people see that $50 fare to Miami they will still book it enough to fill up the plane. Perhaps maybe an attempt at a positive PR cycle through social media, etc, but I just don't see much else if they are true to this new business model. I feel it's just going to be a new norm.