You are free to have that discussion with
@TJ O'Pootertoot in the Yonge North Extension thread. God knows I've read dozens of pages of you debating these same points with him already.
I see I'm being invited to all sorts of fun.
Reading back a bit - and I know this is shocking - I think you're each right and wrong about certain things.
For one, as we know, I think 44's out to lunch on Yonge/7. Naturally, I never claimed "the entire capacity of Line 1 is needed just for a single station" but he has -as we can see - something of a blind spot in terms of understanding the difference between ridership modeling and community master planning. The entire point of the mobility hub is the convergence of transit (GO/Viva/TTC subway) at a single point. He's right that the ridership numbers are getting outdated at this point, though I don't know why anyone would think they're going DOWN when we're already seeing development proposals at Steeles that exceed what's envisioned for Langstaff.
That said, I don't see the point of bending the Relief Life North over to Yonge and I think WislaHD underestimates the ridership potential at 404/7. For one, as 44North pointed out, the Don Mills LRT was going to go there. Secondly, the key to a successful line is connecting to employment. The sheer number of people working at that node justifies traversing the relative lack of latent ridership between Finch (Seneca Campus) and 7 - which, BTW, also has a Seneca College campus. Off-hand it strikes me an LRT would probably be sufficient north of Finch (if not north of Sheppard), but to suggest it's not a good transit terminal because there's a (huge) auto-oriented business park really misses the mark, IMHO.
Plus, it would have the benefit of intercepting Viva riders coming from east of the 404, keeping them off the Yonge extension. Then you'd have ridership being distributed rather nicely, and the Yonge/7 subway would really only be drawing in people from that immediate mobility hub and a fairly central corridor, with people west of, say, Dufferin, being funneled to Spadina and east of Bayview to the RL (depending, obviously, where people are going to/from; but creating multiple N/S options, any way you slice it).
So, you're both partly wrong and partly right, IMHO
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)