since when is high economic activity good? We build products that are designed to break just to people have to buy another one. This 'economic growth at all costs' paradigm has resulted in taking us to the brink of a mass extinction. Take the floating island of rubbish the size of texas floating across the pacific right now. Do you really encourage the pointless hard work that fuels such a system? Bitcoin is about changing the system to eventually make it sustainable. It's like investing in the super-brain of humanity.
Yep and that is the greater good that will come out of bitcoin, does not matter what it's interim speculative value is. Not now, not tomorrow, not even in 5 years, but it will eventually.
I also agree that constant economic growth is not sustainable and not desirable. But I think it's too early for that. Advanced western economies are already approaching zero growth. But undeveloped countries still need economic growth, and a lot of it, if they ever plan to approach western standards of living.
Also, economic growth does not necessarily mean using more resources. Today, most of the things created in economy are immaterial things. Services. This tertiary sector dominates in GDP of developed countries. And it's not resource intensive economic activity. With the development of technology, it will be possible to create more value with using less resources.