Ansem
Banned
If you did a full EA, you could "justify" a subway in a lot of places. The only question is whether it simply makes sense or not. The only change I could see a Sheppard Subway being in the future is to bring the LRT through NYCC to Yonge St and make a full Sheppard East line. Sure subway is good, but past Don Mills, LRT will be able to serve Sheppard well for a very long time.
The EA is not only justifying it but saying the demand meets TTC subway standards and would be profitable. Just dig to VP and when more money comes, curve the line to STC with stops at Warden, kennedy etc.