Don't pilots usually train and certify on just one type of aircraft? In other words, Airbus pilots don't fly Boeing, etc. If all the MD11 planes end up permanently mothballed by the two main operators of them (FedEx and UPS), what happens to the pilots who are trained to fly them? Will they have an opportunity to train on another aircraft type, or will they end up without a job? Are there other planes sufficiently similar to the MD11 that their training won't be too lengthy? Wikipedia mentions it last flew for passenger service in 2008, but doesn't mention it having been developed into anything else.
Of course it doesn't seem like this is a great time to be a pilot, given the ATC issues we're facing in this country - but that's a different issue.