I disagree that one campaign is the reason why new ones don't appear, although I didn't keep track of how many new campaigns a week or a month appeared.
The overall Bitcoin and altcoin/token markets are in a real lull right now. I think that has more to do with it. If conditions were like 2017, we would see a lot more projects raising money and being hyped up -- including with forum campaigns.
Then again, if Cryptotalk posters are pushing everyone else's ads off the page, that could be a real deterrent to starting one...