People keep saying "when the vaccine is ready everything will be safe." (Shorthand, but it's essentially what is being said - "in spring if there is a vaccine we can all sail" is what is coming out here.)
I think people are skipping over the next hard part of the process, which is vaccine production and distribution. We're all used to being able to walk in for our tetanus booster. But a new vaccine doesn't have immediate universal availability. The polio vax, as an example, took about 4 years to really get to most people.
I know some people have faith in modern production and distribution. But I think it's misplaced, particularly in the US where vaccines are being developed on a high-profit model. I think the best case scenario is 18-24 months to fully roll out a vaccine, and that assumes it is a vax more like measles/polio. If it's more like flu, and requires an annual administration, it becomes markedly more complex and drawn out.
And that's not even getting into those who won't get the vaccine.
Even if
DCL is sailing in the spring, it will be on a heavily modified model, and that model will be in place a while.