If you are interested in the history of golf in America, it's very important to read "Scotland's Gift, Golf" by CBM. It's fascinating, tales of golf with Old and Young Tom Morris on the Old Course. (When it was the only course, did they call it "The Old Course?" Probably not)
In my scant attention to the incredibly rambling and wrangling thread(s) on Merion and CBM's possible influence, I kept thinking, "Of course he had to be influential there, he influenced EVERYTHING about American golf until 1930 or thereabouts."
And you are correct that he was involved and influential about every detail of American golf, from design to competition to rules to administration and the USGA as a founding member.
CBM, I think, thought golf was a game for the patrician class so there would always be a highest level of club golf, but I don't think this could have kept golf from being adopted by the "masses."