Tom,
Would a bi-annual listing work better, or a once every 5-10 years? I'm not sure.
I do know that classic courses fluctuate on the lists for some of the reasons you mentioned, but I also can say that I'm not surprised to see PV displaced from #1.
Despite ongoing efforts at removing foliage there, I believe there is growing awareness that it's not happening fast enough to restore abandoned lines of play, bunkering features, and visual vistas lost to time.
What's more, the efforts in recent years to clean up and formalize the formerly wild stretches of sandy terrain are frankly sad. For crying out loud they even ride a sandpro through them every day so that shrubs and other growth within the sandy areas have to be separated with enough space to drive large motorized equipment through.
Conversely, a course like Pasatiempo or Yale seem to have dramatically jumped higher based on sensitive restorations and/or maintenance efforts that bring out the best in the original design.
So, to answer your question, I think it's nice that there's still a forum that reflects the present care and feeding of the classic courses to a great extent.
I'm still waiting to see ANGC plunge based on the tree plantings and other ongoing Frankensteiniation of the place but the exclusivity there likely prevents many raters from actually playing it; thus, the static position.