Not sure whether people's wants - and needs - are unlimited in the short term. In fact they are probably limited by what people themselves perceive is a want or a need, what they know and experience, and their ability to assimilate and absorb new technology. In the long term though...
That's where market-making comes in. People didn't know they needed to search the web until they found out it was easy. They didn't know they needed a computer they saw games, spreadsheets, etc. They didn't know they needed a dishwasher until they saw this amazing machine that washed your dishes. People (the market) might not think up the things they want, but they sure know if they want something when they use it.
