I'm teetering on the wiki thing. You get into so much of a loss of control, because it's hard to moderate an entire wiki.....I've tried. It can spiral out of control real fast. Same with a forum. In order for this to retain credibility, it needs to be governed. I would say that if people want to submit something, we have a form or a general inbox for sending topics, comments, updates and photos. Then the site moderators filter and post accordingly.
Think about it from the "average guest's" point of view. What is going to drive them to the site more:
1. Going to the site to see what the "effects watch team" has noticed is or isn't currently working
OR...
2. Going on Splash Mountain and seeing hopping brer rabbit working, and thinking "ooh! I wonder if anyone has updated the effect site!! Maybe I'll go there right after the ride and see if I can be the first to update the effect!
I think, BY FAR, the better scenario is the second one. I think after thinking about it more, Yoda (I think is the one who said it) was right... An app that is GPS activated that can only be used to edit while in the park would REALLY be cool. And maybe there's a web viewable version of the exact same thing, but it's not user-edited.
I could see riding Splash with the app in hand, and just ticking off as I went what was and wasn't working. That could be fun, actually... If I'm going to ride it 3 times in a day for example, twice I could just relax and take it all in, and once I could ride it with app in hand and a more critical eye.
I think you're right... That policing would be a chore... But I still think it'd be worlds easier than trying to keep it all up to date yourself.
EDIT TO ADD: If you did an app that was GPS enabled and could be used for editing AND a viewable website with the same information, I would think that you could plaster all over the website that the app can be used to help update effects, and would help sell the app. I'd pay $.99 to be able to help keep things up to date. For sure.