The US uses more resources per head than any other country. That's a lot of scope to cut back on what you are using but still maintain the quality of life other countries enjoy. Americans appear to cherish their right to squander resources, and this seems to be at the heart of what will happen. Put those however million people in the army to work building infrastructure instead. Or running public hospitals. Or schools. Or anything more useful.
Or, since there seems to be no change to policy of letting the rich get as rich as they can, divisions in society will increase: some will see no change while others will see drastic cuts in quality of life.
You are preaching to the choir here. I love nature, I have no need to dominate her. I can't tell you how many times I have heard:
Your ATV is small
Your snowmobile engine is small
Your boat is small
Your Jeep motor is small
Your house is small
Your dick is nice and big....well it does seem to consume a lot of my resources
We have been very wasteful.......