Public areas for the friendship impaired would be great. Especially when a lot of people may not have either enough friends on at any given time or not enough who want to raid at all.
Update: If an area were created, then the matchmaking would be up to the players. Since you can only have friends with you for the raid, it would be on your shoulders to interview new people. You wouldn't want to send a friend invite, let alone embark on an extremely challenging mission with people who might be the turd in the punch bowl.
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It could be something like having to talk to a vendor that helps you communicate with other players, He could be called the Raidmaster and have a list of people looking for raid members.