Blocking the number of lavatories for use by the passengers, will certainly not attract more passengers. We need more of them (passengers).
An app or otherwise to request a WC for use, then wait till you are called would be a better plan - get a notice from CC on app to move when WC and isle is clear and clean. (no ques and sanitised).
While at it aircraft - some sheer type curtains between row groups, could help air flow to be extracted to the floor vents.
Order food/drink via app - self remove from trolley when arrives.
No carry on luggage.
Back to front loading.
Remove First, Business and Club boarding as desired privileges.
Terminals - Travelling passengers only (airport staff assistance for kids/disabled - other)
Laptops/tablets checked luggage only (yes has issues to address)
Security checks prior to terminal/check in/baggage drop entry.
App to say your bag/s is ready for collection, proceed to collection point.