It all makes sense, drop a Friday arvo salvo...
I understand there is a number; but there isn't any science to support that number yet, just 'big' gut calls. So ratther than send the ATCs into crisis mode, don't mention a number, just saying we know there will be reductions.
Numbers may not be talked about until "a highly paid consultant" writes a report with the answer they want in it, completely justified of course. e.g. each VFR flight will save $2.37 per flight thus NAS delivers $100M per year in savings, sure!