Haven't you seen any of the games? They already play in an empty arena.
But seriously, attendance has been embarrassingly low for years now. You really can't blame the Maloofs for leaving (no arena/low attendance). The Maloofs aren't running a charity. "If it don't make dollars, it don't make sense"
Though if they moved to Anaheim not only would they be a third wheel.. they'd have to ditch the "Kings" name and probably the whole royal theme/colors altogether because of the Ducks. That would really suck.