Canada

Yes, temperature isn't really the issue for a healthy person. 4:20-6:00 is the time frame of the video I posted above where you can see the section about how snow clearing is handled in Oulu, Finland. (7:38 has about 20 seconds addressing that the cost is still a fraction of what having wider roads costs.) Most there don't even use studded tires.

Beyond that, cars, buses, and rail lines won't suddenly disappear from people gaining the freedom to comfortably ride their bikes. People with health issues (which is what I assume you mean by "help issues") and people who don't like cycling both have the option of driving or public transit and are therefore irrelevant to this conversation (though they would benefit along with everyone else from reduced traffic/road maintenance from slightly narrower streets and less drivers on the road).

Incidentally I straight up hate jogging myself, but you won't find me telling those who do enjoy it that they should go without properly cleared sidewalks (same equipment needed to clear paths for bikes, incidentally) just because I'm in the majority of people who either can't or don't want to jog. I've also complained about big box storefronts that force those using wheelchairs and mobility devices to risk their lives on the road and/or mount/dismount full curbs if they have the gall to approach from the sidewalk instead of the parking lot.

I have and I'm not a man.

I understand if you don't have time to do it now, but don't reply as if you did watch the video when you obviously haven't. One of the first topics the video addresses is weather. (Also, lol at -20/-30, it can get colder than even that in Winnipeg and there are still die-hards who ride their bikes in it despite the limited supporting infrastructure.) Anyway, nobody is telling you to give up your car. But it's selfish and unreasonable to deny everyone else affordable, healthy, and enjoyable commutes and joyrides because you only want to use one type of transportation yourself. If you want to limit yourself to one transportation method, that's your own prerogative, but you'd find there'd be less traffic on the road and less maintenance costs to the city if more varied options were available to everyone else.

I wrote:

We need to aggressively transition away from fossil fuel dependence. We need transit

What you're saying confirms what I am saying. Our transit systems are shit. We need better transit, and we need more transit. And we need densification (as I also wrote), so that transit is efficient and reasonable. We need ways of organizing our cities that don't make the private car to be the most obvious and comfortable option. Transit and active transportation should be the most obvious and comfortable options.