I'm reading now that there's already some stress due to displacements from the Lytton fire earlier this year, and displacements from Abbotsford, Merritt, etc are not gonna help the situation. I'm still trying to piece together the wider scope of the incident and don't yet have a good sense of what the overall damage looks like (though it increasingly looks like it isn't merely "a few key bridges happened to have flooded, it'll be fine once the water recedes" and it's more like "there are several landslides blocking roads along the route to Calgary and we're gonna be scrambling to staff the clean up efforts in time for winter").
On the one hand, you just need enough room for a truck to pass through, dirt road carved by a tractor as it might be, in order to establish a supply line. On the other hand, given that some communities barely only ever had that in the first place, I imagine many might need to figure out plan B arrangements.