Without a doubt, something has to give. It has to give, in the sense that the infrastructure we have for life as it exists right now must change. Everything is so "more, bigger, better, more expensive, more success" oriented that it is almost impossible to to choose that simpler life without having to overcome a lot of resistance.
Here in the USA, I would love to just give up my car and take the bus to work and to the shops, or walk. But the entire system — the construction of our towns and cities — is such that I can't really choose it. I live in the "residential" part of town, and it is 7km just to buy a loaf of bread, and there IS no bus. I can't NOT have health insurance, because no insurance = no service. Or I have to pay 200 USD to talk to a doctor for 15 minutes.
We we really need is the underlying system that keeps us from effectively choosing "less" to change.
RE: Diminishing Marginal Returns...