Thanks for the suggestions everyone. Genius definitely looks interesting.
First, really sorry if the comments still aren’t showing up. I really thought the doc would be working by now, but it isn’t.
The plan now is to wait a bit longer, and then tomorrow if there’s still no luck with Google Docs, I’m going to move the project to another service.
My gut is telling me to use medium.com for this. Medium won’t die under heavy lead, it’s well designed, and it also has some great commenting features.