If people are this open and brazen about it then ultimately we have passed the point of usefulness. This can be seen in social media vote farms where you pay for exposure. Once they start appearing en masse then it is the death knell of the platform.
This also has a chilling effect on free speech and what an individual is allowed to know about an organization, person, company etc. As any 'trusted' source of information is now spoiled.
The way we get ahead of this is do what the internet forefathers wanted to do to any problem... re-route. There are wiki clones and methinks their popularity will only grow now.
This should be the chief concern for Jimmy Whales and the Wikimedia foundation if they actually cared about providing 'an encyclopedia for all' because they are no longer providing a platform for learning but rather just another corporate blog.