Peter, I see what you're saying. I think there are a lot of different ways to look at the tree conundrum though.
You're correct that the committees who planted trees at these clubs acted benevolently and probably did what they thought would really improve the course. I also believe that, at a lot of courses, they achieved success. While Oakmont may be at its best when it's as treeless as when Fownes built it, there are also many courses that have benefitted from the actions of the men who planted trees at them long ago. Trees have added beauty and shotmaking qualities to many golf courses.
At any course, though, there comes a point when tree planting has to slow and management has to happen. We'd all agree that golf cannot be played in an unbroken forest, and we'd also all agree that trees grow over time and become larger than anticipated at the time of their planting. At a certain point if unchecked planting goes on for too long, the course begins to see some of its golfing qualities compromised. Turf suffers, playability suffers, and fun suffers.
That "certain point" varies from course to course. Sahalee can probably accommodate more trees without compromising architectural intent than Oakmont can. But at any course, trees eventually need to be thinned even if they don't need to be wiped out. So like Grant (and to paraphrase him a bit), I guess I'd hope for a MOVEMENT toward tree awareness and management at many courses without necessarily seeing an endless TREND toward wide-open, largely treeless golf. I like the results of the few that have been cut down at my course, and hope for a few more. Several other clubs in town have memberships that have also responded well to tree management programs. None of them are treeless now though, and even though my club began with very few trees, I think clear-cutting the ones that stand today would be as big a mistake as planting another 200.
This current trend of tree clearing will be a big win if it just makes memberships more aware of the need to manage their trees as opposed to treating every single specimen as though it's integral to the course's design. I read a Tom Doak post in another thread that said something to the effect of "People like to look for absolutes when it comes to things like trees (and other features for that matter), but the truth is that there's a lot of gray area when it comes to deciding how to manage them." I agree with that, and if the recent list of high-profile courses to clear trees helps illuminate that gray area for decision makers at the average club and makes them think a little harder about it, that's a good thing. If it makes them say "Trees are bad now! Cut them down like Oakmont did!" then I suspect it's not such a good thing.