PAJ

wait and see - we have been on many cruises (Diamond - one cruse away from Diamond Plus)  and spent lots of money - if that is the case we can spend our money someplace else - we have seen people that have to turn sideways to get in a door - do they need a health certificate? I guess we will discriminate against people for the good of who? 

(My opinion only since many 70+ year olds are healthier than much younger people) 
In a perfect world, all passengers and crew would need written consent from their physician.  We, however, do not live in a perfect world.