Tom Doak,
I would venture to say that most people, including most members of PV are unaware of the fact that the original 18th green had a significant mound in the inner portion of the putting surface.
I would suspect that even fewer are aware of the reason that Crump designed and built the 18th green with that mound in it.
As such, there'd be no inclination to restore that feature, which is unfortunate.
I believe, as you get further away from a feature's removal, that fewer and fewer people realize that the feature was there in the first place.
Perhaps exposure to the original green, vis a vis photos of the original green will encourange some to want to restore Crump's original work.
I would think that that would be an architectural priority given the club's desire to present Crump's work.
One would think that Fazio himself would promote this idea since I believe he's the consulting architect and a member.