The idea that LFG ruins communities is destroyed by FFXIV anyway. FFXIV has the same mechanisms and has far more of a community than WoW did even in Wrath, before LFG. A lot of that is simply because it's more pleasant to interact with other players and feels less forced.
Re: crafting, I think you're a bit confused about the motivation. I don't think they said "Just make it like FFXIV", I think they looked at what crafting systems people actually like and why, and FFXIV was obviously a major influence, but I suspect what we'll actually get will be pretty distinct from FFXIV.