No. There is not the development on Finch for a subway and there wont be for a very long time, or ever.
At least not for 50 years, and then at that time the tunnels, trains, track and everything will need a full refurbishment, and you're basically spending tons of money again for something to be built way too early.
Honestly this should have been BRT like in Newmarket.
The way we built LRT with the Transit City project is completely a waste of money and at odds with how good LRT systems around the world are built. Crosstown is an exception because much of it is tunneled.
Putting LRT in the middle of the road like a streetcar completely hampers its speed, and puts riders at risk when crossing and leaving the island stations. We basically cannot look past how we did streetcars and not mimic that with LRT.
Look at Calgary, Edmonton, Seattle, Portland, Denver, Los Angeles etc etc LRT and you will see how LRT is built properly. Even Ottawa LRT is done better, but it was done so well, it should have been a Metro system. ION LRT is another good example.
All the aforementioned LRT systems use dedicated rights of ways, whether abandoned rail corridors, hydro corridors, closing off small streets and making them completely car free and dedicated to LRT. etc etc. The LRTs are much more separated from vehicular traffic and intersections.
Thats not really possible along Finch (well, you could use the Finch Hydro corridor but its a bit far away and problematic) and so when its not possible to do something like this, smarter minds would say "well it doesnt make sense to use LRT here, BRT would be a way better ROI"
But LRT was all the rage in the 2000's so we forced a square peg in a round hole. The fact that EVERY line in Transit City was LRT is all the proof you need. Its rare that every single line in a 7 line system has the exact same transit type, as there is no one-size-fits-all solution.