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My point was not whether or not Sheppard has sufficient density between Yonge and Downsview (however, Yonge/Sheppard and Bathurst/Sheppard are high-density intersections and Downsview is growing fast). I wanted to point out that this connection will bring new riders (like myself) who are not counted by TTC calculations of potential ridership. After YorkU extension is built, the link would also create a continuous East-West subway connection.
Any new subway line, any rapid transit line in fact, will attract new ridership. That doesn't mean that it is warranted, especially after TYSSE and a parallel LRT line only 2kms to the north that'd siphon away any potential north-south commuters, which in this case is only the 7/160 bus. There is nothing through this stretch worthy of higher-order transit. The Wilson Yard case is a poor rationale. RHC extension could come outfitted with it an underground yard facility at the 407 as was discussed. Trips from York U through to Scarborough don't necessarily have to be via subways and don't necessarily require a series of transfers either. If I told you get from directly from York U to Malvern Town Centre, one-seat ride, within 40 minutes you'd probably wonder how this could be. The answer is simple, since subways cannot go everywhere, make the bus' quality of service comparable to rail transit. Billion-dollar subway extensions and road-median LRT projects aren't the solution for everything. If the city/region wasn't so status challenged perhaps more city councillors would embrace more affordable rapid transit options for its citizenry. It is people like you and I that are suffering in the meanwhile as the fares soar and the service deteriorates.
Sheppard East has a far better justification. Consumers is a major employment centre. Vic Park has lots of nearby apartments, as does Warden and Brichmount. Kennedy has condos, malls. The GO station connection would minimize commutes between NYCC and eastern Markham. This is a continuous sequence of nodes averaging every 1000 metres. If I had to choose, I'd pick it. It's far less complicated to increase the frequency of 84E and 196B buses between Downsview and Yonge than what you are suggesting.