Like any truly useful breakthrough, it takes a long time to mature. And also like any disruption, the potential of Siri is rooted in four principles:

1) Humble early goals which it accomplishes well
2) A large population of enthusiastic adopters who give it sustenance
3) Plenty of headroom in improvement giving it areas to grow into with positive feedback
4) A patient sponsor who makes a stable living

There’s no magic to it. In fact it’s banal. These are only the principles that every parent uses to raise a child.