Before the single was replaced, there was a lot of talk about replacing it with a double. I think that was all from Eric to get donations to keep the single. A double never made any sense there. Go there on a crowded day and count the number of single chairs loaded versus the number of double chairs that load and you will see the single has almost the same capacity as a double.
If they put in a double, they would have had to raise the landing zone and completely rework the summit area. That would expose skiers to more wind. They also would have had to build a new loading zone. even with that, the increase in capacity would have been minimal, but the rope speed would be slower so the trip would be longer. No one would have thought it was an improvement.
OTOH there might be a business case for detachable quad. Then widen all the trails, dynamite those nasty rocky cliffs, get top to bottom snowmaking and grooming, build a hotel and sell it all to ASC. Oh wait...
"Everywhere I turn, here I am." Susan Tedeschi