A couple of things
First the concept of there is no democracy with out a powerfull union movement is pure and unadulterated bullshit. Democracy gets along just fine with out unions, it also gets along fine with unions in the private sector.
Private sector unions have competion, something that public sector unions don't have, Ford employees go on strike Honda still builds and sells cars, that is the equalizer that does not exist in public sector strikes. If there was a serious attempt to privatize the garbage collection that would balance the scale but that won't happen in Toronto.
Second the concept that its in the current agreement it must by god stay there. The sick days bank is not there to provide a " retirement bonus" for employees it was created in the days prior to short term disability coverage which is widely available now.
The pay rates of city union employees artificially raises the labour costs of everything in the city of toronto, there is a rider on all tendered contracts from the city that the winner of teh contract must pay 90% of the unionized labour rate , that cuts out all the non union shops and raises the costs of everything that happens in toronto.