It's good that they're thinking about this in general and providing another option, however, not including Dundas West station (Bloor) is insane.
Imagine all the people along Bloor West who could take the subway a few stops to Dundas West, then take a fast train to Union, assuming the frequent service is there.
That's other thing. Say you're commuting Yonge & Eglinton to Liberty Village, a pretty common commute that takes quite a while. This seems like the perfect candidate for this integration, you could use the subway to get to Union, then take GO to Exhibition, then walk 5-10 minutes.
The GO trip should be faster than the streetcars, but my questions are:
A. is the service frequent enough that the speed advantage still counts over the streetcar (do you have to wait 20 min if you miss the train)
B. You're competing against two frequent streetcars to LV, King & QQW, which are already covered by your token or metropass. Is this compelling enough to make you pay extra? The QQW streetcar has a very direct connection with the subway.
If the service frequency is there and the full trip travel time really is much less consistently, then maybe it's worth the extra $60.
Also, without through-routing like in SmartTrack, someone can't take the train from Danforth-Main station to LibVill.
Having said that, if say, you could travel within all the GO stations that are in the city of Toronto on your metropass or token, and they had frequent service both ways on each line now THAT would be something worth getting excited about.
On the plus side, it says it's a pilot project that could be expanded. However not including Dundas West or Kennedy is crazy.