You're correct about Zeitgeist pissing people off (so maybe it'll only sell in the 200k-300k range) but I'm sure MORE people will listen to Oceania and like it (via torrenting) compared to Zeitgeist because Oceania will be good. That's going to sell itself. The fact that Zeitgeist was mediocre will only make the quality of Oceania stand out more, thereby making the (online small time) media promote it more (holy crap! it's actually good! no really! trust us! listen now!). This is basically what happened with Eminem's last album. If Relapse had been good, it would've made Recovery not seem like as big of a deal. We can't have the counter-factual, but I wouldn't be surprised if Oceania sells just as well/is listened to by just as many people in the Zeitgeist-was-good-parallel-universe compared to our own.
Why so assured that Oceania will be good? Who the fuck knows? Your good could be someone else's trash and vice versa. I haven't heard anything from Oceania that blows the best of Zeitgeist away.