There are a million backups of wikipedia. That's not the main issue, it's the future of the project. If the main org goes down, there will be a million forks of it where none of them have the same legitimacy of the original, edits will die off, views will die off, and the content will become increasingly stale and vandalised.

I see that as an argument for serious research effort into systems of decentralized governance. A project like Wikipedia shouldn't need a centralized community or a singular centralized host. Unfortunately "web of trust" doesn't seem like it will be resolved in a robust manner anytime soon.

You are on the way to the religion pill

in my opinion, such a scenario would end up with a few weeks/months of chaos, before converging on two-three main forks.