China is going to reap more benefits from self driving cars, but they also have (in many cities at least) mass transit in place to truly do multi-modal trips (self driving cars at the end tips of subway rides).

The problem with self driving cars is that they can only optimize road bandwidth a bit more than they are now (and even then, only if you outlaw human drivers), they aren’t a magical shortcut to increasing bandwidth beyond indicated demand (like mass transit can).