I like to think all game developers think ahead with no exception. If they feel this will work, its because they already now how it will work out around the content they have planned. Large scale PvE battles, PvP and heavily instanced content is in the future of FFXIV.

I have a feeling this will work out great. Of course, this is baseless and blind faith, but hey, they are already set on doing it this way, only thing left is to try it out and provide feedback.