As a geek, I just don't think it's possible that a pre-covid Metrolinx or anyone else was able to predict a 10%+ surge in Canada's population in the span of 4-5 years from 2021 after the stagnation/decline in 2020. Something like 14% population growth in GTHA and 17% in Toronto proper up to 2024 at least. Stats Canada has Toronto's population at ~3.3 million as of July 1, 2024 without factoring in the full extent of undercounted visas and overstays. Our roadside signs still read 2.7 million since the census. Not a single population projection in the last 15 years of Metrolinx's publications or news releases indicates that they foresaw 15 years of growth in 5. I don't think anybody predicted this was going to happen, even the IRCC and its Minister.
Speculation:
Hypothetically, if we get 1% annual growth in the GTHA after 2027, we could still hit 10 million in the GTHA by 2031 as opposed to 2041. Potentially 9.5 million if we assume Mr. Ben Tal from CIBC is dead wrong about population undercount.
Article from Oct 20:
'He warned that the current immigration policy had led to undercounting of non-permanent residents, which in turn distorted housing demand forecasts.
“We [have] more people in the country than you think. People say we are 41 million. No, we are 42 million in the country. But we are not counting one million,” Tal said.
Statistics Canada’s official estimate for Canada’s population as of Q2 2025 was about 41.6 million.'
https://www.mpamag.com/ca/mortgage-industry/industry-trends/we-are-in-a-recession-cibcs-tal/553608
https://economics.cibccm.com/cds?id=858756bd-a8fc-4920-8ea4-e1dcd1c104d4&flag=E
https://www150.statcan.gc.ca/t1/tbl1/en/tv.action?pid=1710015201
Then again, RTO is not fully in effect and TTC ridership is still down from pre-covid. It really is hard to say how high ridership will be.
P.S. the original debate was about route capacity, and how exactly Line 5 Eglinton was supposed to meet its own goal of hitting 15,000 passengers per direction per hour with its rolling stock.