JES II,
It's a difficult question to answer.
I don't know that Merion can defend itself at the greens against the greatest players in the world without approaching extreme conditions.
Let's look at the first two holes.
How can they defend themselves at the greens against the best players in the world ?
What can they possibly do except narrow the fairways, grow the rough lush and deep, and make the greens as hard as concrete ?
I realize the Merion is three courses in one, but, in shoring up the robust holes, will the softer holes get goofy ?
The problem I see with this discussion is that the forward looking answer is NO. But, Merion's not alone. The answer will be NO, universally, for all other clubs because the best players in the world will continue to hit the ball farther, straighter and higher, rendering every venue obsolete.
You and others have fallen into the same trap.
The answer is not in the continued altering and beefing up of US Open courses, defending them as if the Huns are coming.
The answer is, the USGA has to do something to with respect to the ball and equipment.
Change the ball and the equipment, not the venues.
Limit distance, increase flight variation, decrease club head size, limit shaft length, DON"T lengthen tees, move bunkers, narrow fairways, grow deep, lush rough.
You've taken your collective eyes off of the ball.
The manufacturers, like magicians, have you focused on one object while they continue to misdirect you by changing the other.