I personally doubt there will be many issues making parties when people are actually motivated to create them. Although for dungeons and stuff it would be nice for there to be a list of players to sign up as.

"Interested in joining a group"

Then again forums and normal social interactions have been the backbone of a orginizational hub like this, and I'm sure they would do perfectly fine for people looking to join linkshells and other such groups for group events until they find themselves a good group of friends to play with.