It's been pretty clear for a good while that Bale doesn't want to put in the work anymore. Can't exactly blame him either, he's made for life and barely as to play for Los Angeles to all. There's no way Wales wouldn't select him for the World Cup squad and he'll just retire afterward. I remember one of the commentators saying that a move to Cardiff would have been way to tough for Bale due to how challenging that league is, so this move makes perfect sense.
Plus there are some great golf courses in LA.