You do realise that if Toronto did secede from Ontario that other than Ottawa you would have Saskatchewan on a bad day?

Factoid: Toronto is responsible for 22% of Canada's GDP. 

It could quite adequately operate as a separate district or better yet, country. The issues that Toronto faces are not simply a surprisingly incompetent City Council, but the continued interference by both provincial and federal governments and the continual drain of Toronto taxes to outside projects adds to the mess as well.

You combine this with reality disconnect of the left leaning voters who refuse to accept the reality that the city is collapsing directly due to the unreal expectations that they should not pay any taxes for any services and you have a real mess to deal with.

The only simple answer to this would be a biological die off of the entire 416/905 area and start all over with the infrastructure intact.