I'm not sure why you're getting downvoted so much. Acceleration that is too slow can be very dangerous (my old girlfriend had a junker that couldn't get up to speed quickly and almost got rear ended a few times) and also disruptive to the flow of traffic. The more efficiently a car can flow through lanes (i.e. merging farther left on the highway without having the next car have to brake for you) can reduce traffic.
What do you do about the delivery trucks? The tour buses? The semi trailers hauling backhoes? Are you looking forward to a brave new world in which all of them do 0-60 in 5 seconds?
When I was a kid Porsche made a car that did 0-60 in ten seconds. And Suzuki I think bragged about how their hatchback could do it in 8 or 9 and compared themselves to Porsche.
