Mike,
Maybe one day it would make for an interesting post for someone like you that is very knowledgeable about Merion to :
Pretend your a top pro playing in an Open at Merion, and what clubs you would probably play off of each tee, and what club you would probably have in for the 2nd shot, assuming you're in the fairway. You could assume the standard Open fairway widths of 28-35 yards, which is what they do year after year. You could also assume dry conditions. Lord knows what the scores might be if the course was very soft. Anyhow, my guess is that the pros, in dry conditions with narrow fairways, would NOT play bombs away from the tee, but instead would iron Merion to death off the tees, stringing them down the middle (dry conditions, and you know those guys could string those irons) and having a lot of short iron 2nd shots on the 4 pars. In other words, they would play percentage , stroke-play golf. The USGA would probably not have the guts to widen the fairways to encourage attacking play, which could lead to the double-bogeys.
My whole thought on this would MOST of the 14 clubs in the bag get used, or would it be the long iron, short iron Open? As you probably know, Meeks of the USGA is saying there are 12 or more wedge shots at Merion. Doesn't mean he knows what he's talking about, but it does make me wonder if a representative bag would be played at a Merion Open. And a representative bag being played would be my goal. I know that is harder and harder to do. One other thing, would Merion have to be tricked and slicked past the point of fairness as we all know the USGA has a thing about scoring?