Overall I think that the direction of the impacts of this are clear, the magnitude of the impacts will depend on how long it takes to start to get to whatever will be normal.
Internet will be more important, we will do more on line learning instead of classes. Some universities have already announced all online for 2020/2021 academic year. Work from home will become more significant especially in the knowledge worker segment. It will be harder for companies to say it cannot work once it is proven and people become accustomed to it.
On line sales will become even greater, brick and mortar stores will pretty much disappear, especially in specialist niche markets like dive shops.
Travel will be much less common. Business travel will slow down as companies use virtual meetings more and more. People will be careful of the risks of being caught a long way from home so localized travel will be more common compared to long distance foreign vacations.
There will be a huge slow down in construction, more work from home will equal less need for new office space, highways and public transport. The need for new stores and malls will also decrease. There will be an increase in the infrastructure to support on line shipping, expanded internet capabilities and more distribution centers. As people work from home and commuting distance becomes less important people will move out of dense urban housing into more single family homes.
Thinks like gyms and theaters will start to disappear, people will build more home entertainment systems and rely less on mass entertainment.
For diving the tropical resort dive operation world will take a major hit. With less people traveling and the need to maintain a larger social distance restaurant capacity will have to drop by 50%, live abords will be almost non existent because of fears of being in close confinement for days with people from all over the world.
Local diving will become the norm, most diving will be close to home, people not living within a couple of hours drive of a dive site will not become divers, people with only access to cold water diving will not take up the sporty because of the increased difficulty of learning in cold water and the additional expense of having to buy a dry suit.
Now depending on if there are second or third waves and how long these take and how serious they are these impacts may change in magnitude and duration. I think that a serious third wave, if it happens will be late in 2021 or into 2022 and the impacts will take a decade to fade. Some like the fear of another pandemic will take a couple decades to fade.
Some impacts will not fade like the idea that someone would drive to an office an hour each way every day will seam as quaint as engineers using slide rules does today.
If a vaccine or a dependable treatment becomes available by early 2021, then these impacts will be minor and within 5 years we may not be able to tell the conditions apart from what might have been without the virus.