Well, in 2019 the group Staff Salary costs were £412,400,000 or £35,360,000 per month (yes that is millions) all off their report and accounts.
People will want to travel, that is a given, most working people won't have any money for holidays this summer, so won't be going abroad anytime soon. However people will still travel for work and other needs, which suits the low cost operators not holiday companies.
For all everyone's complaints Ryanair are best suited to survive this and they are still paying their staff somthing at the moment.
This has the potential to put the industry back years, or even decades.