Anything is possible-

I recently found out about a concept called bicycle boulavards: http://www.ibpi.usp.pdx.edu/guidebook.php
Essentially, it’s a shared street with an emphasis on bikes. Cars are allowed, but low speeds discourage drivers who aren’t residents of the neighborhoods. It sounds a lot like a woonerf to me. It may be the sort of thing they have in that neighborhood called Vauben.
I’m actually in favor of methods that allow cars, but give priority to walking and biking. When you try to disallow cars completely you just end up having to build huge multi-lane roads and parking lots right outside the neighborhood. You just end up moving the problem to outside the neighborhood and aggravating it somewhat because you’re concentrating the cars.
Cars in the city should be slowed and spread out. Drivers need to be confronted with obstacles and other forms of transportation to remind them they aren’t on a highway, but on a city street. Separating car traffic by putting it on the periphery of a neighborhood still gives cars priority in that area outside the neighborhood, making it hard for bikes and pedestrians to move between neighborhoods. Does that make sense?

Bikes are a good replacement for how a lot of people currently drive. If you drive by yourself and don’t have to haul a lot, you could easily switch over to bikes or public transit. There are even some pretty good bike trailers out there. In Boise there’s one or two bike taxis. Cars don’t have much advantage in speed in Boise, either. I’ve seen cars zoom past a bicyclist then get stuck at a red light. The bicyclists and slower cars always catch up while the speeder is waiting at the red light. It’s pretty funny, although I’m not sure if the speeders notice. They’re probably too busy talking on their cell phones.
But I don’t think it’s a good idea to completely exclude cars and trucks. We need to get rid of the overuse of the car, not the car itself. Cars and trucks do fill a transportation niche. Trucks can do a fairly good job of taking lots of goods from a train to a specific store, for example. People in isolated rural areas still need something like a car or truck. If cars and trucks didn’t exist, horse and carriage would still be here. Something has to fill that role. That’s why I think roads should still allow for some cars and trucks. I guess I’m saying I’m not with the purists on this one, but I’m still on the side of bicyclists and pedestrians.
I’ve never been to any of the places mentioned in the article, so I don’t know exactly how they function. They probably allow in some cars and trucks out of necessity. If I ever go to Europe again, I’ll look for some of those places.