We do much the same to our own ageing grandparents, who may be tired, frail and in pain, and looking forward to shuffling off this mortal coil and an end to it all. Instead, we won't let them go, we tell them how wonderful they are to keep going, how we couldn't bear to lose them, how indispensible they are to us. They are aware of all this - any one of us who knows they are probably in the last decade of their life is aware that they are winding down.
Or perhaps we should tell them it is time they signed off, they are no use any more, they should be making room for the next generations?
The Queen isn't daft, or senile, she can make her own decisions. Younger members of the RF are doing more each year, and have been for some time. There will be a transition, and it will be in the next few years, but at the moment it is happening gradually. They are being eased into place. The Queen is still head of the Firm, for the time being. Like Grandma still being the matriarch of the family, though others are taking more and more of the burden.