There is another endgame that I will concede is considerably less likely to happen, but I will maintain remains possible: the end of the modern-day nation-state.
My evidence for this claim? Very few nation-states if any are growing as fast (in terms of net worth) as the largest multinationals, but the multinationals are still relatively agile (read as able to mobilize their strength behind a common agenda). Sure at the moment, the largest multinationals have only as much net worth as some of the poorest countries. However, look at how cities and states try to out compete each other in order to have companies like Amazon and Foxconn set up their headquarters. How soon will it be until countries start competing with each other for something similar (building your next regional data center in EMEA? here are the contenders). If the multinationals really wanted to milk it, then they could totally make a game show out of it à la Eurovision.
States partition the surface of the world and each person withing their borders is subject to their law (even foreign people passing by.) They have exclusive access to people.
Multinationals don't have borders and don't have exclusive access to people and they don't (currently) wish to because they sell different products and it would be pointless for them and for people to be able to buy from only one company.
So that endgame would work only if multinationals take over and rule the world together. That happened in Continuum https://en.wikipedia.org/wiki/Continuum_(TV_series) a Canadian dystopian sci-fi TV series.
My evidence for this claim? Very few nation-states if any are growing as fast (in terms of net worth) as the largest multinationals, but the multinationals are still relatively agile (read as able to mobilize their strength behind a common agenda). Sure at the moment, the largest multinationals have only as much net worth as some of the poorest countries. However, look at how cities and states try to out compete each other in order to have companies like Amazon and Foxconn set up their headquarters. How soon will it be until countries start competing with each other for something similar (building your next regional data center in EMEA? here are the contenders). If the multinationals really wanted to milk it, then they could totally make a game show out of it à la Eurovision.