[EDIT] see reply - should say 40 million but what the heck, I ruined the joke.
Otherwise, just moving to the country just means you're dependent on infrastructure in different ways. You might be able to grow your own food if you had to, which is an option city people don't really have. That's worth something.
Chilliwack and Hope might be cut off, though I think it's possible to get there via minor roads/unusual routes. Abbotsford is partly flooded, but areas that aren't should be accessible. Lions Bay/Squamish and Maple Ridge/Mission are fine, as far as I know.
So if a 1-2 hour drive is the limit, then parts of Abbotsford/Chilliwack/Hope are pretty miserable right now, but it should be fairly localised.
On the other hand, you can argue that most of Southern BC is "peripheral" to Vancouver, despite parts being 4-5 or more hours away. Those parts will have more issues, since you start getting into places where the only connections are (were) the highways that flooded and washed out.
https://www.bcafn.ca/news/fnlc-calls-state-emergency-due-unp...