I don't think that a temporary/test conversion would ever work. Most of the intersections are signalized and only aligned for one-way traffic. Turns to and from corresponding N/S streets are also currently set up based on 11th and 12th being one-ways.
The conversion would have to be all or nothing. Which is why I think that it is a little misguided to think that these roads will suddenly become a pedestrian paradise if converted to two-ways. It would be a massive (and expensive) undertaking, have a negative impact on traffic and parking, and would leave the pedestrian experience pretty much the same as it is now. Heck, even if were neutral for cars, there isn't an overwhelming benefit to pedestrians.
On the flip side (and I know that this would never happen anyway), would 17th Avenue die if it were ever converted to a one-way? Not a chance. That road is vibrant because of the businesses on it and the inviting pedestrian infrastructure. So why would 11th and 12th become Meccas for pedestrians if the only thing that is different is two-way traffic?
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