Margaret et al....
While I am not a (founding) member of PRGC, as were a couple of GCA'ers, I can speak as someone who's been on board the past 6 years...
I do like Ghost Creek quite a bit, just as it is, even with the containment/spectator mounding on some of the holes; however, it was always intended to be the "Championship" host course at Pumpkin Ridge. As the public-access track of the two, there is some cachet attached to marketing the course as "Host of the so and so Championship, etc.", in this challenging golf economic market. Perhaps Peter P. can speak to whether hosting the Jeld-Wen Tradition has been a boon to the Reserve or not..
Either way, I don't think it would be an architectural travesty to alter Ghost Creek in a (perhaps vain--double entendre intended) effort to win a future PGA or men's USGA event. Whether or not you and I might think the Women's Open and Women's Am are "major" events, they are not the same thing as the men's events, in the eyes of the public, and perhaps in the eyes of prominent interests at the club...
There are actually places to pick up yardage at Ghost Creek without changing the inherent nature of the course--it is only 15 years old now anyway, and does not have the fast history of championships that Witch Hollow does, so why not consider some changes. I can perceive that some might make for some very exciting possibilities...
However, Ghost Creek does have some things that Witch Hollow does not, and if an alteration were to eliminate those, hmmm...It has the two shortish par-4's which Witch Hollow really doesn't. It could be argued that those could be made better, and in the end they would probably play the same for the paying public later anyway...
What I would hope would not happen might be a "Composite" course, with perhaps some resultant substantive changes to holes at Witch Hollow, or perhaps an insensitive re-working of Witch Hollow. I suspect Bob Cupp would be involved no matter what, and I think (in this instance) that would be a good thing...
In the end, I don't think that Ghost Creek is enough of an architectural treasure, that some work, lengthening or otherwise, would automatically be a bad thing...
Peter