I will enjoy watching the amateur at Olympic, as I played the championship there in 1981. I have not reviewed the record book but I believe the cut was 157- the highest in the history of the Amateur to that time.
The tree program will be an enormous factor. In '81 I'll bet there were parts of the Lake course that never got direct sunlight. The ground was not quite soggy, but damp all the time. Combined with the heavy ocean air, drives over 250 yards were very rare.
Interestingly, the Ocean course average score was a fraction higher than the Lake average, if my memory serves me correctly. That was certainly a reflection of the sun dried fairways and the wind, since the course played along the ocean cliffs in spots. (I believe that two or three of those holes are now part of the beach.)
The quote from the SFC article about the USGA criticising the eighteenth green is most certainly hyperboly. I did hear that the USGA told the club it could not conduct another championship there with that green as it was. But the club made the choice to change it. As it was, 1/3 to 1/2 of the green could not be used for hole locations due to its steepness. Remember Payne Stewart's four putt? T. Meeks took a calculated chance and lost. But there was a lesson there- something had to change.
The US Amateur needs eight hole locations, and the old green simply could not handle that many if only half of it was available. Yes, they could slow it down, but it would have been an awful lot to make it the unused areas playable. Remember the Southern Hills Open? If you start playing with green speeds like that, you'll get burned one way or another.
I believe the members of the Olympic Club want good, stern test, and to hold major championships. The changes to the 18th green allow them to do so. The hillside surrounds, the clubhouse looming over the green, and the stately eucolyptus, palm, and pine trees make a grand stage, and I'm glad Olympic is still part of the USGA championship equation.