Market was always a disaster to drive on, and so as someone who mostly drives in the city I'm for this change because the worst thing about driving in SF was that you might end up forced onto Market Street and the fundamental rule of Market Street was once you turned onto it, you were never allowed to turn off it until it dumped you into the bay.

But I think the idea that this will be the spearhead to big changes is fundamentally a farce. Market already had enormous sidewalks, pedestrian-first intersections, and all that crap. And it was already the only part of SF that was actually well-served by public transit.