IMO it is extremely likely that the watershed has been infected for a long time.
I don't know of any testing that was done in the Banff area at least, until the first lost trout was spotted in Johnston Lake.
The good news, if there is any, is that in locales in the US where the disease has been present for years, they are seeing rebounding populations that are resistant to the parasite/disease and get along ok.
I expect around 5 to 10 years of tightened fishing regulations to preserve existing populations, and then perhaps a rebound in populations and a return to "normal" keep limits.
Possibly the biggest impact will be felt in watercraft - I could see a potential watercraft ban on some unaffected rivers getting passed thru the legislature. I also think it is unlikely to work, and that all watersheds will eventually be affected.
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