You might pay for a few services you use frequently, but a lot of your time is probably spent on a "long tail" of various sites you're not going to pay for.

Advertisements are de facto micro-payments and they work really well. We don't even all have to pay (shhh). They're a small price to pay to keep the web growing the way it is. I think an arms race and eventual truce is the most likely result.

I think startups focusing only on things people want to pay for directly would reduce the number of startups dramatically. Having eyeballs as a currency which can be exchanged for money is unbelievably powerful.