While they may well decide that outsourcing IT was a false economy (a 500 million quid fine can do that - not to mention the cost to the brand image), it's a whole lot harder to bring IT back inhouse than it was to outsource it. This isn't like cleaning the restrooms - it takes months, even years, and large bags of money to build the IF infrastructure back to where it needs to be for a major airline.
Heads should roll. Not that they will, but they should.