Lincoln Fields is not available.
The city's priority is serve the growing suburbs south of the airport. The choice is to spend millions on rail or millions on roads. The city has chosen rail and it is overdue. The city cannot justify spending on the airport spur with limited ridership at the expense of those who actually pay taxes.
Without provincial support, I highly question how the city proceeds. All the design work and EAs are done, and the bidding process is complete. Major revisions will mean that much work has to be redone. This means delays measured in years.
It may mean whatever they choose not to proceed with will have to go through an EA again, like the Trillium Line extension did after the original N-S LRT plan was canned.
But I still don't buy the idea that the City would say "because we didn't get $1 billion of this $3 billion plan, we're not going to build anything". The $3 billion plan will just become a $2 billion plan, with some difficult choices about what gets the axe being made.
We saw the same process happen in 2008 (ish?) when McGuinty cut Transit City from a ~$12 billion plan to an ~$8 billion plan. Eglinton West, the eastern portion of Finch West, the eastern end of Sheppard East, and the Malvern extension of the SLRT got 'deferred', but the remaining portions of those 4 priority lines proceeded. Rob Ford came in 2 years later and threw a grenade into the entire thing, but that's beside the point here.