User blog comment:FairyRaven/Fairy Tail Chapter 437: Magnolia, Review and Commentary/@comment-115.147.98.72-20150529055036

Maybe Makarov wants them to grow as a person. That not always the time there is Fairytail. Maybe he wants them to experience life without FT. Find something new for themselves, seek answers, or simply put to be free from their comfort zones.

Cana was able to write for his father, Warren was able to invent a communication device, Kinana learned new magic, etc. And that if FairyTail is till there, one day it will be rebuilt.

Although it can be argued all these could be done without having to disband FT.