It's important to note that the Yonge corridor between Hwy 7 and Finch is a key development node for the GTA and is the densest, most transit oriented part of York region's master plan. The population forecast for people living within 500m of a subway station between Finch and RHC in 2031 is 160,000 residents and 68,000 jobs. Without this extension York region will be unable to fulfill the Provincial government requirement for municipalities to have 60% of their development in transit oriented developments.
From that report it seems the job and pop. numbers are within the traffic zones, not within 500m of a station. And these traffic zones are up to 2km away from the extension.
Within 500m of stations what's projected is 58k ppl and 29k jobs (still ambitious, but def not 160k and 68k). Keep in mind this is
projected development, and statistically/historically projections for suburban development have been way off the mark. Specific to Langstaff, the 500m point is an important one since the site is almost 2km long - with seemingly no transit plan to bring future residents beyond walking distance to their station. The visionary who designed it spoke of a pod system, and YR proclaims a +60% transit mode share - but there's obviously something to question there.
The other point about how without a subway York Region can't attain the projected development, or the usual argument about how a subway is the
only way to carry the projected demand... that's not really true. And the chart on p.24 of that doc about mode/capacity is a bit flawed. It shows LRT and SRT maxing out above 10k (but below 15k). However when YR presented their study of transit modes for Yonge north of 7 they were much more holistic in their approach (this is something not seen often, and I commend them for it). On p.56 of their EA they showed "Advanced Light Rail Transit" (i.e a slightly smaller subway), and acknowledged its capacity of 15-25k pphpd. In other words we know for a fact there are rapid transit options that can carry above and beyond the best case scenario for YNSE ridership, that can allow for above and beyond the TOD proposed, and which is more affordable, flexible, and would have higher frequency than a 6-car heavy rail subway w/ every 2nd train turned back. Yet it hasn't been looked at.
For those decrying 2 transit lines to RHC, and claiming the Richmond Hill line Go line is sufficient, the attached document shows (pg 26) that only 16% of riders have Union as their destination while 77% of those riders will pass through Bloor station. Obviously the vast majority of transit users will be traveling into Toronto but for most of them Union Station is not a suitable end point.
Important info no doubt. I think people should read this chart and the paragraphs below it. Though for your own argument's sake it's probably better to use the more recent 2013 BCA (but this report is still good). On the page you mention it says that in 2031 the speed of the RH line will be circa ~2000-era, that there will be no fare integration, and that service in 2031 will be 15mins max. Also that
a significant number of riders could be attracted from the Yonge Subway extension to a GO Richmond Hill service with sufficient improvements to its speed, frequency and fares.
Believe it or not the RH line is seeing some mild improvements at its southern end today (which theoretically will bump its speed, albeit marginally), that newer rolling stock and cab cars are being rolled out (more marginal speed improvements), that 15min peak has been promised by 2021 (a decade before 2031), that GO-TTC fare integration is to be in place soonish (and is being used in DRL and SSE modeling), and that according to the regional RTP by 2031 the line will be vastly improved vs today (not surprising since it had a great BCA).
So if 77% of YNSE's riders are headed downtown, and at RHC there's an alternative providing a significantly faster trip on an integrated service (30min vs 50min), GO's 15% mode share allocation will rise substantially. Or rather, YNSE's ridership will
drop substantially. By how much? It's hard to tell, and the 2013 BCA which presented different scenarios failed to do a side-by-side comparison of any GO improvements alongside a Line 1 extension to RHC. Sure a subway to RHC is a nice-to-have, but it doesn't seem necessary. And just like we're scrutinizing the DRL and SSE to look for affordable alternatives and find ways to lower ridership, I think the public deserves to see the same for YNSE.