I don't think it will all melt away. A foot of man made snow has the liquid equivalent of maybe 5 feet of natural and if you look at their live webcams, they are just absolutely pounding Superstar. Like others have said, elevation helps a lot, not to mention late October sun angle is same as early February. Also, Killington is hosting (once again) Thanksgiving weekend FIS race which also gets it plenty more publicity and gives them another reason to keep the guns firing.
Being able to drive to 2500' is pretty rare for a New England mountain. Bolton Valley is the only other one I can think of. As for other elevated lifts, the others that come to mind are the fixed grip quad at Cannon, the summit chair on Mt. Ellen (Sugarbush) and that summit chair on Sugarloaf. I think the bottom of all those lifts are over 3000'. The double chair at WV probably had the highest base elevation at about 3500', but it's gone this year, being replaced with a tee bar. FWIW, those chairs are for sale for $400 (I got one on hold). If anyone wants one, send me a pm.