Kudos Fork Master for even posting this thread, regardless of the comments so far.
* Eglinton line would be 20 years too late. Too expensive to build subway now.
* Line to York U makes sense, probably a surface route is best.
* Sheppard subway might be a white elephant. It basically goes now where. Only saves about 5 mins vs an express bus to Don Mills.
* Even Scarborough LRT is debateable. Right-of-way bus from Kennedy to Scarborough Town Centre is almost as fast.
That said. if you look at some other world city systems, you'll realize that they generally have a "radial" system versus a "grid" system. Take a look at Montreal, London, Paris, Stockholm, etc. Even cities hindered by water have better solutions, check Amsterdam, Barcelona, Copenhagen, NYC.
Basically, TO got screwed with poor planing after the subway boom in the 60's/70's. TO got buses while GO lines used favourable rail corridors. However, GO caters to 905ers coming into TO for work, period. It also has has less frequent stops.
btw, anyone see any benefit of the St Clair W right-of-way between Bathurst and Keele. It did work for Spadina Ave.