Hi Ryan -
I didn't realize you were a Burgh guy. Let me know if you ever want to grab a beer when you get home.
You raise some interesting points, ones that I've mentioned peripherally in the past, mostly in regards to Oakmont. Fox Chapel has wonderful gentle terrain, unlike many courses in western PA, but Oakmont has the very similar, relatively severe, topography you find all over western PA. And yet, there is only one Oakmont.
I'm a little confused by your statement that most local courses are unsuccessful. Do you mean financially? Do you mean they aren't highly rated in the various rankings? Or is that just your our opinion as to the level of architecture?
Certainly most of the courses you mention see a lot of play. My home course, North Park, is pretty crowded for basically the entire summer. I know they can be hard walks (though I don't think NP is very hard, due to the very short green to tee walks, actually, I think it's a great walk, couldn't be much more natural).
I think Oakmont is special because it really uses its severe terrain uniquely. I can't think of another course that uses a hillside as effectively as Oakmont with its incredible 1st, 9th, 10th & 12th.