Well.. Not being as radical as Martin
, I'd say wikipedia isn't exactlly available for everyone to edit, and i consider it as a good thing. Not everybody is right, and if wrong information was uploaded, it might induce much people in error.
I think control is important, the important is that the moderation is correctly done.
Though, i don't support the blog's author's opinion, I wouldn't consider wikipedia as "dead" because it is trying to protect itself from spamming/vandalism.
After all, even forums have moderators, and forums don't have the responsability that wikipedia has.