User blog comment:B214/Chapter 475 thoughts/@comment-4829046-20160229114938/@comment-4933386-20160229121243

I mean they could probably always relearn magic again... During Fairy Tail Zero... the Treasure Hunters was able to obtain magic from their training, (can't remember if there's more story behind this) and they were completely human with no magic usage to start with.

Unless using Third Origin breaks the container that stores Magic Power... which means they can't regenerate them anymore... hmmm.