It's possible, but it will be a monumental effort for them.

Being a WL is a full time job. All those years doing it would be lost time to gain other skills, unless they put in the effort of having a solid backup plan at the same time. Maybe studying for a degree or learning how to start a business of some sort.

This route is probably too hard for them. I reckon that's why we see so many ex-WLs turn to low skill work that pay well if they do a good job, like becoming a realtor.