[jpatokal]

So what are you going to do when you can't get disposable plastic bags anymore?

Personally, I kind of like Finland's solution: plastic bags cost money, but not much ($0.25-ish), and they're way sturdier than the usual wispy ones in the US. So they're reusable (unlike paper bags), there's an incentive to reuse them, and they're way more functional and sturdy than paper bags.