Ah not a big fan of the Keynes methodology for a lot of things. He's the reason if I remember correctly that things are so fucked up, people following his words like a bible of late. One of those old dudes, not sure which one it is lol.
Yeah I reckon by the time we get to that "retirement" age, it will likely keep pushing so far that it's not attainable by most. I honestly wouldn't put it past the governments to push retirement to 80 in our lifetime sadly. They want to keep pushing the carrot a little further away with the stick, hoping that like a good horse we keep following it hoping we can get a nibble.
I think with creating different side hustles and income streams, as undesirable as it may be sometimes, it's very likely that many can retire at a good age from a formal career and enjoy doing smaller things for fun and some extra money. If I could do something related to what I'm doing now for the next couple decades I think I'd have a lot of fun with that and would be happy. I've moved up the "ladder" into my role and I could go for higher yes but I'm not interested in the stress that comes with that and the other things that I know are associated with it but is something I am not at all interested in. My wife thinks I'm crazy for not doing it but then I wouldn't get time to be at home and try to do the far more important job: being a dad!