2 of those clubs, Haze and Pure, are undergoing multi-million $ renovations and being rebranded. that is common in Vegas.
Sad thing was Life at the SLS has been booking good underground artists on Sundays the past few months (Seth Troxler, Sasha, Pete Tong, Loco Dice, Apollonia, etc.) but the turnout wasn't good enough to keep it going weekly. They may be keeping 1 night a month however.