i think you are a victim of a little wishful thinking here. with around a billion people getting into the middle class you are going to see one thing only and that is an increase in resource usage. the normal populations usage is not the problem but the industry that support their consumption.
you arent seeing humans change, you are seeing technology allowing for other types of living but any actual effect on climate they wont have.
This is where I'm really happy that the cult of mustachianism[1] is spreading as virally as it is. More people than anyone could ever have imagined, up and down the economic spectrum and up and down the Cost Of Living spectrum, are banding together to save money, and by extension, reducing their carbon footprint.
It's getting big enough that I get the feeling that the new status signifier is (slowly/glacially) becoming being able to live without excess. This is great because it will slowly shift the goalposts of what people aspire to.
[1]: http://www.mrmoneymustache.com/2012/03/07/frugality-the-new-...