Perhaps. But how often are such conditions an issue? Heck, humans, if they venture out, don't do well in snow. Accidents also increase in rain.

To move the needle - towards a true tipping point? - autonomous vehicles don't have to be everything to all people all the time. Certainly for a significant number of driver miles it's moderate distances at moderate speeds.

Finally. Something as simple as a vehicle being able to deliver itself (from some central hub) to your door and you drive it (non-autonomously) from there would be significant. That changes the ownership model. It changes parking requirements, etc.

Yeah, the holy grail might be a ways off. But there's plenty of (pardon me) disruption between now and level five.