Well, taking the most obviously affected instances down is a good start, anyway.

I’d give it at least a day or two to see how things shake out, unless it’s really important to you to have that community up all the time.

I think that’s a good sign. It probably means the problem is being dealt with by admins. Any communities on the affected instances that have subscribers on other instances will be backed up on those other instances, so most of the content is safe no matter what. I just hope the users on those instances know they can come to others in the meantime.