I don't think they'll remove the gc restrictions. I saw a theory on this somewhere though I don't remember where. Ishgard is now staged to be a 4th gc. It's possible that this will be a merc gc, where people queueing as ishgardian will fill in the ranks of whichever gc is needed to start the match. I thought this idea would be perfect and really hope this is what they do.

Also could do a new type of PvP that is fc vs fc.