I know that Tommy Paul will take me out for a whuppin' for the severity of this comment, but based upon my most recent visit to WFGC, their tree-thinning program of their famous trees (Even a book written about them), more than decimating them to about 30 (40 max) trees per hole would go just fine at PVGC. Adding width is of no consequence there it is all about aesthetics, no real change will occur in playability, but strategy can be regained in some places. More trees gone, more bunkers can be restored, Tom will agree with me on that one.
Considering what the original vistas there were at the time of construction), I think the trees thinned as much as they can get away with before mutiny sets in would do just fine. Splendid isolation of holes might work at Shadow Creek, but I love the old pictures of The Valley as much as any old "looks" (Since this board seems to be mostly about aesthetics and the "look" lately, my 2 cents).
(I haven't played there since January or March, so there may be even more gone now!)