Canada doesn't need to pick up the slack. The rest of the world, including Canada, needs to pick up the slack. This could take a while, but there are drug researchers in Canada and Europe, and other parts of the world. They are being presented with an advantage when Trump incentivizes investment in their existing pharmaceutical industry. Ramp up time may be an issue, especially if investors think America is going to return to its old behavior within 4 years. If they don't believe that, they may well invest heavily and early, which could be a win for all of us.
(2 of the 3 first COVID vaccines originated outside the US.)
"Hey, little guy, is an asteroid gonna kill us all?"
Cluck cluck!