According to Schmidt, Apple has "caught up". OK, for sake of argument, let's say that's the case. So now what is Google/Samsung gonna do? That's really what they were really asking him. And he didn't have a good answer.
Why is that requirement an issue? I've normally got my iPhone connected to in my car's USB port for audio system integration. So now I get "Hey Siri" for free. Not that pressing the steering wheel button to activate Siri was inconvenient before.