Not to mention there was a fully funded, above ground, grade separated transit project that would have been up and running last year (the Scarborough LRT)...which was apparently bad for many of the reasons the OL is great.
I can't remember how many instances there were of people suggesting the SSE made sense because it future-proofed the project.
At the very least the government could've made a serious effort to put these extensions above ground.
It's hard to take people who support the SSE and EWLRT seriously when they criticize the idea of spending more to use larger vehicles or increasing the capacity on the OL. If that's a problem, then they should be absolutely livid about how the SSE, EWLRT, etc. are being implemented. Instead it's mostly met with shoulder shrugs.
By 'transition to' I meant a standalone line vs extension. All the points continually made by a group of posters (TR bad, tunneling bad, 6-car too big, too excess capacity, high cost, extreme depth, low density, etc)...they all hold true for suburban extensions. Doubly so in many instances. And there's truth to their points. Not like we're talking a few mil here - these extensions are some of the world's most expensive transit projects, with further extensions to be had in the future. Yet outside the RL/OL thread I haven't seen them mention any of their points, which is pretty backwards.
Except none of these extensions would be cheaper. I want you to think about this logically. Let's say we choose to replace the Yonge Line with a Light Metro extension. Problem #1 You now have to build an MSF for the line. Problem #2, you know have to build a new platform at Finch Station which really wouldn't be easy (unless you want to make a Cross Platform Transfer at Finch, but that would seriously reduce the capacity of Line 1). With just these 2 additions, you are now looking at a project that would be the same cost as the current subway extension, but let's continue. Forcing people to take a linear transfer at Finch would be absolutely ludicrous. If you're on the Steeles bus, that means instead of going straight to finch, you have to transfer at steeles, then take this light metro to Finch, then everyone transfers to Line 1, which is absolutely silly, and also dangerous. When you have a linear transfer, you are basically forcing all of the people riding on one line to transfer to the other line all at one, leaving people to rush to get from platform to platform. One of the biggest issues with the Scarborough LRT plan is that linear transfer. In 10 years, the Scarborough Line is projected to carry over 100 000 passengers per day, and imagine all of that traffic just stampeding down 3 floors at Kennedy as all of them rush to get on a train to Line 2. This is why linear transfers create so many problems.
Now one can make the argument that Line 1 should be extended to Steeles, but that's even worse since now you have to get 2 different TBMs, and at this point you get the literal opposite of economy of scale. Adding a light metro as a cheap way of extending a line has literally never worked. I can only think of a few places it has been done, and none of them have been successful. I'm looking at cities like Moscow, San Francisco, and hell we literally have the SRT here in Toronto, a line that was so bad that even though it terminated right next to the highway, Kennedy is still one of the biggest parking lot stations on the system simply because people don't want to deal with it, and just drive from the 401 to Kennedy. The Scarborough LRT wouldn't have fixed this. It would be wasting money on a line that is literally worse than a refurbished SRT.
The Ontario Line is a completely different story. Its a brand new line on a brand new corridor, that serves its own market of riders. Its not a tumour that sticks out at the end of another line, its a completely different service area. Using different rolling stocks is totally fine here. Same story would've been for a light Metro on Eglinton or Sheppard, had they been built with this technology at the start.