Perhaps a sequel to Year Zero could be on the other side of the spectrum (at least at first). After the collapse of modern society, there could be a return to a more primitive nature and the record could sound more primal with more analog instruments – real drums & guitars, less electronics. I still love the glitchy sound of Year Zero and it's so ingrained in the DNA of that album that it's hard to imagine a potential follow-up abandoning that element altogether. But maybe the album begins devoid of that sound and it creeps in slowly as the album going on (and as society builds itself back up). The theme of the album could be that society is cyclical in nature and even though we keep building towards something great, we are destined/doomed to destroy ourselves and our demise (at our own hands) is inevitable. History repeats itself. Kind of like the themes of Terminator 2 & 3 ("It's in your nature to destroy yourselves."). But Maybe that's too similar to the latest Ghost album, Impera, which is about Empires rising and ultimately falling.