All the more reason to shift to a pay-per-use model rather than the high-fixed-cost model of car ownership, which incentivizes uses your car for as many trips as possible once you've made the initial expenditure to buy the thing. If these get good enough and cheap enough that significant numbers of people can get away with ditching their cars, those people will probably end up in a situation where transit (including kinds with no tires) will be cheaper on a per-trip basis where it's practical, and robocars will make sense for the remainder.

I'm definitely not disputing that, although I think "emissions" are generally understood to be airborne. Micro plastics that run off the road into storm water are pollution for sure, but "emissions" seems misleading.

And obviously fewer/no emissions is also referring just to operation, not manufacture or disposal or power plants either.