I don't believe the company is going to open a western domicile that soon. I think Vegas is very competitive with spirit, southwest, allegiant, and everyone else. I think the company will hold out, wait for more planes and evaluate between Vegas and Phoenix...a little further down the road.
They'll let the Orlando base shake out for a while before they add another base. I bet a western domicile doesn't open for a year. Just my guess though. Also, my money is on Phoenix.