Cruise industry already has 185,000,000 vaxxed customers waiting to book cruises.
Most vaxxed are seniors and adults which is the majority of the cruising crowd. In my guess 90% of regular cruisers are already vaccinated.
Some people are just waiting to see results of initial cruises just starting in July. Those results will decide if cruise industry revives and how fast it revives.
If ships are full of vaccinated passengers, I expect problem free cruise results.
“seniors”
Covid vaccinations are only about 90% effective in the Geritol generation.
If you as a senior got the flu after regular flu vaccinations, you may wish to avoid crowed places as much and as well as you easily can.