User blog comment:ChaosKnight/Fairy Tail To End After The Next Arc.../@comment-26984533-20150909155107/@comment-7418318-20150909160928

I don't quite see the point of the queston.

Why would anything happen with the anime once the manga ended?

Unless they cancel the anime prematurely, it will have to continue after the manga ended, since they can't see into the future.