People come to Wikipedia to get an answer. Many users of Wikipedia are kids, or non-native English speakers for whom contributing is a challenge. Or laymen that don't know about the subject and naturally don't feel like they could contribute anything. Or people who simply don't know how to contribute. Or people visiting via mobiles where it's really difficult to research and contribute. If you adjust for all those us…
Deletionism is the thing that will kill Wikipedia, by deleting itself and gradually narrowing the circle of permitted contributors. There are some situations where the non-English Wikipedias have far more information than the English ones though, because of how "notability" works.
https://en.wikipedia.org/wiki/Wikipedia:Size_of_Wikipedia
Deleting articles doesn't prevent anyone from participating, since anyone can write/edit articles on any notable subject. The deletion process protects Wikipedia from search engine marketers who try to promote their clients with biased low-quality content. They can go to Quora for that.
https://en.wikipedia.org/wiki/Wikipedia:Deletion_policy#Reas...