I find it much easier to get a flash point group if you go to the questing planet of your level. Not sure about level 50, but the planets I've been to even have shuttles back to the flash point.
I'm against the lfg tool myself, I prefer to physically form a group and even physically enter the dungeon compared to being teleported from anywhere in the game. But if they do add it, I hope it's just a server wide system, before Rift went cross server it was fun to group with familiar names and even see them later on while questing or in a city.