O'Leary has a point tho. Public transport between airports and homes is pretty much unrestricted. Badly applied social distancing, sometimes non existent.
If there's a scientific reason to quarantine international arrivals (which remains to be proven), the purpose is pretty much defeated the moment you mix with public transport.
My view is that the 3 weeks review will take us to the end of June when it will be relaxed. Ryanair and others have decided they want to restart in July and that's what'll happen.