On what level do you mean? 2fa already broke at one point (no clue if they fixed it I don't use two-factor as my twitter account is not terribly important)
You'll know the level when it happens - I am referring to multi-day outages. 2fa being broken doesn't surprise me at all. I bet the didn't want to pay the bill.
Oh yeah the full "can't access the site" could be a long way off. Could also be tomorrow if the wrong thing starts breaking and no one left understands how to maintain it.
To be clear, it could take years.