Just go ahead and do playoffs in June/July if you have to. No live audience. Have it centralized in one location since with no fans, home ice doesn't really matter. Edmonton itself may be a great pick.
You can't shut down society indefinitely until December when a vaccine (hopefully) arrives. Millions of people will have lost their jobs as things like restaurants and movie theaters and salons will go bankrupt, universities and schools closed for parts of two school years will be a massive disruption, etc. etc.
The idea now is to try and flatten the transmission curve, we're past the point of stopping this entirely. Flatten the curve in the next 3-4 weeks as much as possible so that hospitals have the best chance of coping, after that the reality is I think the emphasis is going to have to shift towards isolating people who are 70+ years old after that. You can't have Western society shut down for months on end just to protect 70+ year olds indefinitely, I hate to say it.
The government is going to probably eventually have to stipulate people in that age range stay home and there are services provided where they can get medical help, groceries, etc. sent to them at home. And also workers at nursing homes and things like that are going to have to be strenuously tested.