Jim,
I'm not suggesting everyone needs to have the same club into the green, or that such a goal is even really desirable. I have advocated for a set of tees at around 4,200 yards for multiple reasons, but let's keep to the original topic.
What I'm saying is that Ben Hogan was one of the longest drivers of his time, probably much the same way Justin Thomas (despite a slight build) is one of the longest today. Here's from a 1949 Time Magazine article;
• His average drive was 265 yards – Ben was one of the longest drivers on the tour in 1948, the 2014 PGA Tour average was 290.0, the driving distance leader in 2014 was Morgan Hoffman with an average of 318.5 yards.
• He had a 100 yard spreads between his 7 iron and spoon (3-wood) and his 3 iron and driver
• His 1-iron averaged 195 yards.
• His "spoon", which is equivalent to today's 3-wood averaged 235 yards.
Assuming that's all true (he also used to earn extra money doing long driving contests against fellow tour players), comparatively how long would the 18th at Merion need to be for Bryson DeChambeau (or Justin Thomas, or Jon Rahm or Tony Finau or Dustin Johnson or Rory, or many others) to have to hit Driver, 2-iron to reach it in two?
I'm thinking somewhere around 600-700 yards. How is that a sustainable model?