[@Neo Is Delight]

Slayer magic isn't inherently more powerful than any other magic, it has been proven time and time again. You even said so yourself. I personally think it'd be neat to explore a bunch of dragon slayers doing things in a guild. If you can't come up with a proper challenge for that then something isn't properly balanced. In the beginning Natsu and the other slayers were hardly 'end all powerful'. He only got that way after some training and challenges.

The easy way to fix that would be to have everyone simply be new slayers to the guild, and not all too powerful. B rank at most. There, bam, fixed that issue almost immediately.

Besides, I doubt all the slayers would get along. Who knows? Internal conflict between them could be a very real thing. People with that amount of power always clash heads in some manner.

*Shrugs*

I suppose I'll just have to respectfully disagree, here, but I do think it'd be doable fairly easily, personally.