User blog comment:NeonSpotlight/Where did comments go?/@comment-3213322-20120807180012

My opinion is that reducing user interactivity such a severe amount is a pretty easy way to cut the wiki's popularity and also largely reduces its usefulness to the pursuit of trivia. As the game community has progressed professional players have put more emphasis behind analyzing the game and even Riot is slowly becoming better at explaining the basics. The wiki's information is not as relevant and directly helpful when it comes to learning gameplay as other sources, but it does offer a unique framework for discussion on each particular detail of the game.

So, you could reduce the wiki to a database that is generally only helpful to people heavily interested in the theoretical side of the game outside of gameplay and trivia tidbits and I'm not going to think it would fall apart like that, but I would expect usage and development of the wiki to stagnate.

I don't see any problems if you want to block non-registered users from editing. It's a completely painless process to get an account which takes like half a minute.