I've been in Texas and loved it. Y'all seems to be in regular usage. My favourite story of the use of "Y'all" is that a friend who was a diver on off-shore Oil Rig and the Texan Supervisor mentioned that the diver (singular) should taker a break "y'all should take some time out". So, signalling all the other divers they, naturally surfaced and took time to have a break. Texan Supervisor was not best pleased to see every diver on boarsd the Rig and announced "Hey! when AAH said y'all take some time out.. I said y'all not all y'all" !!!!