Never happen...
Regardless of any relationship to numbers of pax per toilet, it's the crew that will quickly put a stop to any decision to remove all the loos!
The EU would never allow a workplace (i.e. the airplane) to be devoid of any toilets for those that work there.
Same as your employer cannot remove all the toilets from any workplace, regardless of where that workplace is.
This is all purely shock advertising value from someone whose done it all before!