Approaching the issue of getting people to stop driving everywhere by just making it a pain in the ass to drive and hard to park is putting the cart before the horse, results in nothing better than hellish gridlock other cities have and we don't just quite yet, political outcomes you don't want, and makes people angry in a way they're not going to soon forget. It's the equivalent of the Republicans' "starve the beast," thinking they were going to remove demand for public services by defunding them. You end up with a lot of people so frustrated they start demanding parking minimums rather than heading for the solution you want: easier non-car transportation. If people had something, like a parking spot in front of their house, and you take it away, they don't automatically reach for the solution they don't know, the reach for the solution they do know, which is attempting to get their parking space back by forcing more parking.

Oh wait, that actually happened. Starving the beast (of parking, in this case) is already proven not to work. You want better solutions, you make sure the solutions are provided first.

You have to build it (streecar, light rail, bike throughways, lots of bike parking, bike security) and they, the users of those systems, will come. Give people an easy path to walkability and they'll do it. As more people do it, more will follow. That's a bit of a radical suggestion simply because it involves heavy government investment of taxes, but we must invest more heavily than ever in street rail travel to build the city we really want and need. In a way it's a blast into what worked beautifully in the past: we have to bring Portland back to what it was like in 1912, which was the pre-car streetcar era.

Look at the two decades in public transportation in Portland prior to 1912 and you'll see the solutions. They built urban rail lines before the neighborhoods existed to support them, and the neighborhoods and commercial centers sprang up.

I'm a researcher and and interestingly I've been tied up with a transportation project rather intensely for a few weeks now; it's funny to visit for the first time in a while and see this. Clearly the issue is on a lot of people's minds.