Perhaps a solution to that is to have everyone serve X number of years in the nation-scale defensive behemoth, and, after they're done, they can retreat to the

Perhaps a solution to that is to have everyone serve X number of years in the nation-scale defensive behemoth, and, after they're done, they can retreat to the good life. That's actually how military service is being organized in countries which are at a significant threat (e.g. Israel). In broader context, we can have everyone say working 20 years in modern, corporate world, so that it does not crumble and we still get to enjoy its benefits, and then retiring to quiet life. It's what people some people with higher salaries are already doing (the FIRE movement), and with more wealth in the economy it would be available to everyone.