It's going to be a lot longer than the winter to engineer and construct bridges over those expanses. Unless they can jerry rig something for truck traffic only, I don't see this being rectified anytime soon, or even in 2022. Although I could be wrong.
Vancouver is cut off from the rest of Canada for now. But that also means that a large portion of the province won't get food deliveries as easily. Supermarkets are bare already here in the interior. Costco is almost post apocalyptic. We have two possible routes through Golden and Jasper, which have been known to close frequently as well.
Highway 3 will be the first to get opened I think, but it's a long, twisty road.
The trains aren't getting through either. Here in Kamloops they have been parked.
I've read that at the border crossing, emergency measures have been put in place to allow BC residents to return home with not much more than a driver's license.