It's one of those vicious cycles - it's really hard to stop once it starts.
Also, bear in mind that China's recent economic growth has been mainly internal consumer driven (external infrastructure investments have slowed down noticeably as belts are tightened) so while they aren't as fucked as America would be they could see a dramatic rapid decline.
People buying less, ie being more risk averse, and not wanting to take on debt, is a net benefit for everyone. Buying less means less ecological impact. Being more debt averse means fewer wage slaves.
The only people who suffer from "buying less" are corporate owners.
Definitely agree on the ecological advantage, but the current economical system that provides most of the jobs of people here would deflate, people would lose jobs. Less human activity will always be better for ecology, but there's probably some activity we want to keep to make our lifes good.
There's also the fact that debts increase in relative value over time, therefore discouraging people taking out loans for various purposes (mortgages, starting businesses, etc.), which was a major reason for the protests against the gold standard in the US around the late 1800s - see the Cross of Gold speech.