I like the concept of a content finder. Ever spent 1+ hours just trying to find 4 people for a quest that literally takes minutes to accomplish? Or tried gathering 8 people for an af run that also would be finished within a couple of minutes? Did you ever ask for help in all your linkshells and received no answer, not even a "sorry, no time", because everyone is too occupied with his own stuff to help you? I've had way too much of it~ Having to beg and wait most of your playtime every day is... mildly said annoying. I do prefer some events with people i know, but between those , i just want to play.
It won't change the community as much as you think by the way. It is really hard to get order into a group of strangers, and it's way easier to accomplish things with your own team. Random groups will be more likely to fail in grand fights. Players will always prefer the company of their friends and linkshell mates over strangers from elsewhere, whenever the opportunity arises.