It may come down to a showdown between each country's leaders. Trudeau just a few minutes ago said it will be "many weeks" until they are ready to open back up. I have not been to a hunt or fishing camp in Canada that was owned or employed big Trudeau fans. Thus, while summer fishing trips are extreme social distancing relative to normal life in Vancouver or Quebec, he won't be motivated to help the rural types of tourism.
https://globalnews.ca/news/6826929/coronavirus-trudeau-economy-and-canada-u-s-border/My trip has us crossing the border on 6/5. This is year 47 consecutive and we are already talking about a fall option if necessary. However, that removes the school-aged kids from the trip and that would be a huge loss.
