The trees and the reverse camber should be quite the restrictor plate on scoring then?
Let's remember that these are professional golfers (and a few top notch amateurs), I doubt the trees will bother their good shots all that much. No doubt that the winner will likely be the straightest driver of the week, that's usually the same MO whether the course is Olympic or Shinnecock.
The single biggest factor that will throttle scores is the firmness of the turf. Only when the fairways get firm and fast does the reverse camber matter, if it is soggy like at Congressional, tee shots will stick like lawn darts.
If it is firm and fast, trying to keep the ball from rolling through the fairway into the rough is paramount, the Tiger 2-iron zinger will be used on many holes including the 505 yard par-4 first hole. In fact, you may see guys hitting 4 and 5 irons on 430-450 yard par 4s to try to control the ball, to the extent they can, when it hits terra firma.
And it is an over generalization to say "the trees", the width of the fairway corridors, except for a few holes is actually quite generous, look at the Google Maps Aerials and slide through the time period from 1938 to the present and see the changes and thinning of the trees.
In fact, if Mike Davis really wanted to shock the pro's, he could eliminate all the rough (on holes 4, 5, 9 and 16 would be a good start) all the way out to the treeline so that tee shots will continue to bound into the trees, instead of catching the rough. Being in the rough on the outside of the dogleg on those holes is not all that bad but if you were 20-30 yards farther and in the trees, the recovery is that much more difficult.
The largest impact of "trees" is near the tee box, the somewhat narrow chutes that you hit out of on 1, 4, 5, 6, 9, 12, 14 and 16. It's doubtful that Bubba Watson will be aiming 30 yards right and hitting a big old country slice and finishing in the middle of the fairway.
I have many photos, here are a couple that show how much more open, visually, the Lake is since the last Open.
3rd hole - 2004
3rd hole - 2009
Looking across 5 green up the 4th fairway (before the clearing, you could not see any part of the 4th fairway)
And Jay, if you come to 'Frisco for the Open, don't call it Oly ...