Personally I think the capability to locally build UCAVs and ramp up production if necessary is more important than actual numbers. Operationally I don't imagine you would ever need to have more than a handful in service at any given time. I suspect most of the training could be done virtually.
Erm, isn't the point of these things to help overwhelm defences by, amongst other things, numbers of more disposable assets? Like for example four f-35 with a small constellation of wingmen? Certainly more than a couple unless I've totally missed the point.
oldsig