I doubt the sales of ebikes will change.
I get OP's point, there's no doubt that the risk of death by COVID-19 will be decreased dramatically by individual health.
Healthy and fit people will have better immune system, and scientists have proven that exercise is one of the best ways to keep us healthy.
However, think again, do you see anyone registering for fitness classes since the COVID-19 outbreak?
Did you see the sales of junk food / fast food going down, and did people all the sudden rush to health food stores and bought organic health foods and omega 3 & vitamin supplements to boost their immune system?
Are people getting outside more, cycling, running, jogging, going for walk, lifting weights and joining recreational sport teams?
I doubt it.
It will boost the sales of toilet paper, disinfectant chemicals, wipes, masks, etc.. but not bicycles or sports/fitness goods.