I think this is it exactly, if you've ever taken the 7 you know the turn from 14St SW on to 12 Ave is a bit too tight and that curb ages every other day when the bus drives over it.
Depends what your perspective/goal is for the area. To drive through the area, one ways are best but that would make turning them into 'Main Streets' pointless. Parking right in front of where you want to go might be horrendous, but there are numerous parking options off the street (behind the strip mall on the SW corner of 33 and 20, in the strip mall on the NW corner of 33 and 20, in the lot beside the Odeon, behind the strip small at 33 and 19, and there's also the Safeway parking lot). It's weird people will go to a mall, park once, and walk to where they're going but in a situation like this that's similar they say there's no parking.