You realize guilds and dungeon finder aren’t mutually exclusive? During wrath I ran with my guild when guild mates were available. If they weren’t and i had an hour to kill, i’d queue up in DF. If you only had a partial guild group, you would queue up as a group.
This Post Hoc fallacy really needs to stop. Many of the detrimental effects to the community people blame on DF are already happening in TBCC. Is it the dungeon finder’s fault when the feature isn’t even in the game?
I also don’t see how having more opportunity to interact with people is somehow anti-social. With LFG channel today, you might get a run or two in a couple hour play session. With DF this would increase significantly while also allowing the player to leave the capital city and go out into the world; again increasing the likelihood of social interaction.