We are very consumer based, at some level even the producers are just consumers, that use what they consume to create something else for someone else to consume usually. I would say that is just part of our way of living, in a society of people. The only way for us to have no consumers, is if we are all self sustaining, hunter gatherers really.

Perhaps at one point our species was consumerless, but the fact is, we work way better in a group, which means there will be consumers. I like turning steel into usable objects, I don't like mining it, there for I must be a consumer at some level. If I was forced to produce everything I needed to build something complex, like say a PCB board and components, it would take a life time to get everything necessary to produce something not all that spectacular.

I think the "bad" part of consumerism, is more a psychological state, like using drugs to escape a problem. Consuming on its own, isn't necessarily bad and you're right, very necessary. Perhaps its all psychologically based, I feel better building something, more than I do just waiting around for the next movie, or video game to distract me from my life. But really, whats the difference if what I produced just ends up sitting in the corner collecting dust, why I'm building something else?

In that sense, being a Producer, requires a Consumer, someone else to find what you have made useful. Otherwise all I've been is a consumer. Producing at worst, is a consumer, at best, helping make society a better place. Consumer at best is a Producer, at worst, just collecting, and creating a market, for junk to be eventually thrown away.