Mercenary said that people would take Sheppard to Spadina.
You said No because of time.
I said they might transfer due to convenience.
You said there is no convenience benefit.
I said yes because of new riders.
If you want to say that we went off on a tangent, I can accept that.
The point of Mercenary's argument was that such a line would divert traffic away from Bloor-Yonge.
Your argument, is predicated on the trains on Yonge still being at capacity.
I would see these to be in conflict.
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I would also suggest we see very little evidence today of people bypassing St. Clair and going to St. Clair West in the hopes of getting a seat, or boarding a train earlier; notwithstanding greater crowding at that point on the line; and a much shorter distance between those 2 stations (albeit going btw by streetcar.
I simply find it unlikely given the material time disadvantage that a statistically significant number of riders would make that choice.
Regardless, it's moot, if your argument is that even with a Sheppard extension, that the Yonge line would be maxed out.
That would be an argument in favour of Bloor-Yonge expansion.
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Please note that I'm not opposed to Sheppard-West, though it certainly isn't the #1, 2 or 3 priority.
But I don't think the argument the line would relieve Line 1 is particularly compelling.