I don't know. I've always written off claims of "the UFC is dying" as a bunch of whiners who decide they don't like it as much as they once did, but I was shocked by how empty the sports bar was. I showed up early to be sure I had a seat, and I got a table right away. The restaurant was never full the entire night, and this was supposed to be the biggest UFC ever. Back when Brock was fighting more regularly, I remember having to wait over 45 minutes at a BWW to get a table.
UFC 200 could get over a million buys, sure. I wouldn't be surprised. But I wouldn't be surprised if it underperformed, either.