There's also the fact that 11th and 12th are in the Beltline, the area of our inner-city that has the most significant population density. If the trade-off is to keep 9th, 6th, 5th and 4th Aves as one-ways and turn 11th and 12th I think that's a win. As for the downtown one ways... You can't park along those avenues at rush hour anyways so at rush hour just use a curb lane on each for a bus lane, another fair compromise from an all-day bus lane (blocks with numerous stops already act as a permanent bus lane, 5th Ave at Bow Valley Square and 6th Ave across from the Intact building).
I wonder what closing the Chumir's safe consumption will do for the area around here. It should move some people out of the area but again, like with closing the DIC, there needs to be a plan for where services will go that serve those people.