Why not taking into account the algorithms of "people climbing the same things as you" and "suggested mountains" to allow or not allow a user to contribute into a page.
Wikifying is a good idea but must be done with extreme care. The biggest danger is in my opinion... adverts appearing into SP pages.
If any changes are made the priority should perhaps be given for a mechanism that allows editing pages from authors who haven't connected since a long time. For the current time and for all case prior to any change perhaps something could be done regarding the climbing log, number of points and pertinence (based on "people climbing the same things as you" and "suggested mountains")
And, finally, I join my voice to all the others for congratulating MVS. I like a lot the ideas developed there, but I'm afraid the real world isn't as idyllic, and many firewalls will be needed.