By Daniel Kline Sin City is about to literally see its skyline change as two icons fall and a potential new one arises. Every Las Vegas icon someday falls. Sometimes a classic casino or attraction meets a spectacular end — with an implosion as a sort of a grand send-off. In other cases, a property falls into disrepair only to be quietly shuttered until a new owner comes around. The Las Vegas Strip has seen legendary names go away and new ones arise from their ashes. Time, however, seems to come for everyone and everything. It was, for example, hard to think of Sin City without Siegfried & Roy…