At the end of the day isn't it all about maximum coolness?
Yes, but there has to be a little substance behind it or it gets stale really fast. The first time god slaying was brought up I thought it was a decent concept, but then the explanation came and it deflated w/e expectations I had.
Now god slayers are there just because. We don't know how the origin of their magic nor do they seem to have any importance like the dragon slayers. Are we going to see any of these gods that this particular style of magic can defeat ?
Probably not. Mashima already admitted in an interview that he doesn't really give a shit about FT, he is writing it still because of the cash and he is now focusing on his new upcoming manga.