Exactly what I was about to say. He's never publicly said about trimming, but the royals have been trimmed down when you look at it in comparison to when all the 'smaller bunch' rumours started.
In the 80's and 90's when Charles opinion of trimming started there was a lot of working royals. The Queen, Philip, QEQM, Princess Margaret, Charles, Diana, Andrew, Sarah, Anne, Edward, Sophie, the Duke & Duchess of Gloucester, the Duke & Duchess of Kent and Princess Alexandra were all either full time working royals or expected to be.
Then the slimming started with Edward and Sophie attempting (and failing) to be part-time royals. Their children were announced to not be having titles, which started the process of Charles' nieces and nephews not being working royals.
I think it's very clear that at this point in time Charles was expecting the monarchy to have slimmed to him, his wife, his siblings and their wives, and his children and their wives. The slimming was that his nieces and nephews from his brothers wouldn't be working royals, like the Queen's cousins were/are.
Atm there "should" be, since the death of the Queen - Charles, Camilla, William, Kate, Harry, Meghan, Anne, Andrew, Edward and Sophie. That's quite the cut from the previous list. With the age gap between them and Charles, Andrew, Edward and Sophie would have been expected to be the bridges between Charles' reign and William's until William's children were old enough to be full-time royals.
I think the plan then would have been full time William, Kate, Harry, Meghan, Andrew, Edward and Sophie until such times as the latter three went part-time and were replaced by William's children. Each generation slimming down a wee bit more rather than a dramatic cut.