Andrew has to know he's simply on the wrong side of this argument, surely? He has to recognise that in the 21st Century, there is just no appetite among the British people for an extended working royal family.
It seems to me that in the past, that is before the Internet, having a large Royal family increased the opportunity for the public to "see" a royal. With the Internet, we all can "see" the royals on a fairly regular basis. It takes fewer royals in order for the public to be aware of them and their activities. I think a smaller cadre of royals can provide adequate coverage and too many royals can lead to overload.