I disagree with everything that Zizek says in this passage. What is strange about recognizing that global capitalism is here to stay, given the track record of the other two ideologies he mentions? The "cosmic" catastrophes (which are merely earthbound) aren't something that I see getting much interest from the general public, let alone obsession. Global warming does get interest but he doesn't use that example. The examples he does give, asteroids and viruses, are real things, that anyone who knows about agrees are real problems. They are in fact easier to imagine than any "radical change in capitalism", because they are vastly simpler. Newtonian physics applied to rocks in near vacuum. Replicators whose only perception of the world is as atoms they can use to make more of themselves. There is nothing paradoxical about this.

Absent from the passage is any hint of an idea for the radical change in capitalism that he presumably wants to see. Perhaps he describes one elsewhere?