About as ridiculous as shutting down Jabber federation on GTalk because that was the only measure Google could take to limit spammy invites.

Google has come down a lot from their pedestal last week. In my book, this Jabber federation issue put them on par with "two teenagers in a garage".

So, ridiculous as it may be, today I believe one spreadsheet can bring GDrive down. Last week I had a different opinion.

I agree. Google Drive supports an entire world of Chromebooks, startups, small businesses, and quite a few large businesses. I can't imagine the traffic from a Reddit thread would bring the service down. Even if the doc had something malicious in it (which I doubt is possible because Drive doesn't allow for executable code), they surely have failsafes to wall off any bad files from the rest of the service.