This site is incapable of ever becoming mainstream for myriad reasons. To begin with, Null would either have to sell out to big business or a government in order for it to be allowed to stay on the Internet unmolested by trannies (and, good luck, they molest everything). As a result, the site experiences frequent downtime and is often not up on the same URL, accessible only on the spooky darkweb. Not to mention the monetization limitations imposed on it by the powers that be. This limits its reach and growth significantly.
Aside from that, the subject matter is simply too niche to really grab a foothold in the mainstream. Even setting aside the site's reputation scaring away many to begin with, laughing at retards is looked down upon in polite society for some reason. It is far from the current zeitgeist of social media apps, functioning as a 2000s-era message board that further limits its appeal. There will absolutely be waves of edgy teens who buy into the site's reputation wholesale and come on here to embarrass themselves, but its format and atmosphere appeal far more to the established crowd who misses the era when such a site was commonplace.
Not to say that any of it is a bad thing. Much of it makes this site extremely unique and will create (and already has) an extremely loyal cult following. It has enough posters to keep things fresh and content rolling, but not so many that the site is an unusable cesspool of retards. We have enough people trickling in to where things stay interesting, but not so many that the quality of the site is compromised. Kiwi Farms has a pretty good thing going, and is really in a sweet spot of where it should be.