Most people don't want to pay for anything. Look at all of the workarounds for news sites. I try to pay or donate for most of what I use but there seem to be a lot of people who want to get everything for free.
The problem is that micropayments are not interesting for most news outlets: the friction of current solutions is high, the resulting revenue stream, unsteady. Monthly / yearly subscriptions bring a better revenue stream, and cost way less.
If micropayments were indeed zero-friction, and effectively zero-cost, maybe they'd be (reluctantly) integrated.