I wouldn't say I'm content with them. I want to improve them, and I suggested a method for doing so, which is force people to bear the true costs of their actions and use that revenue to build up alternatives like better bike lanes, bike only roads, better and farther reaching public transit, reduced congestion etc.

I think car-free zones are fine though, for the record. As I mentioned it just seems like you'd need a transitional period where you build up good alternatives. As an example, I ride BART daily, but I meet a lot of people who don't because they think it's dirty, smelly, and dangerous (in their perception). That has to be fixed before you ban cars entering San Francisco.