I'm not suggesting they do away with the 'aaht and abaht' stuff completely. I agree that they need to be seen to connect with 'ordinary' people. But I don't think that there will be much interest in minor royals opening hospital wings or visiting country fairs, in the way there was during the queen's reign. So I don't think there's a great 'staffing' crisis. The 'core' royals, which is to say the King, Queen, William, Kate, Sophie, Edward and Anne can manage it, and later on the Wales children can get involved, even if Louis and Charlotte are not 'full time' royals.
That's the direction most European royal families are moving in. Granted, most of them have much smaller populations than Britain, but even Spain, which has over 40 million people, only has the King and Queen as 'working' royals.