Fediverse

No, for the same reason forums can't replace reddit. Self hosted wikis have been around before and after fandom. The reason it became popular was giving you all the fandom wikis together, one account, discoverable, user friendly so regulars can contribute. If I have to sign up to every fandom wiki I can contribute to, learn a new interface (likely something old and not mobile friendly) and rebuilt up any reputation to gain extra editing rights... I just won't.

Ibis then in theory allows you to use one account, federate your reputation, use one interface, with lots of third party options if you don't like the official one (if lemmy is any indication) and have discoverability of new wikis.