Just my .02
As you group with players that you enjoy doing content with, put them on friends. I have YET to have any issue getting a group for flashpoints. I pick the few runs I want to farm every day for gear and get the group together from those people I've enjoyed grouping with in the past. If there's a spot open, I pug a person in. If they suck, I put on ignore (so I don't get them again). If they're reasonably good and I wouldn't mind doing more stuff with them, I friend them and when I need to fill a group the next day, those are my "go to" people to ask first.
So far, I've only found 2 people while doing flashpoints that have annoyed me enough to remove from my groups. If you wipe, people actively try to work together as a team to figure out what happened. Dungeon finder removed that team work attitude in WoW once they realized they could behave any damn way they pleased and have zero consequences on the server they played on. I don't think this game needs that.
I don't really see that there's a need for a finder system to be put in place if you're actively networking in game to find people you enjoy playing with. Find a solid guild and make friends in it to do things with. You shouldn't NEED a system to do this for you.
The only thing a finder system does is let the people that like to solo content do group content and there's really no point in it. It's a MMO folks. Go out there and find others in game to do stuff with. You DO NOT need an in game feature to do that for you. That's just damn lazy.