The same people who get into CAS without a clearance now would surely do the same whether ATC was done by humans or robots ?
to Jumbo Driver - you say :
"On the other hand, if the pilot is a "numpty", then do you really think that saying "ROCAS" is going to make any difference?"
Yes, because a lot of the numpties think that because they have been told to contact another unit, that they have a clearance to enter the new unit's airspace. Saying ROCAS will make the point that they don't.