It will be intersting to see how the finances evolve as the central family gets smaller as going forward there will be less expenses.
Atm (rightly or wrongly) Charles, following on from QEII, is likely fully or partly funding housing for Anne and Edward & Sophie’s london bases (was Buck, think it’s now St James), and family homes of the Gloucesters, the Duke of Kent, the Michael’s of Kent, plus apartments for Beatrice and Eugenie.
In the future presumably (going by how they’ve done things, not as what I think they should) they will likely cover George, Charlotte and Louis as well as Beatrice, Eugenie and possibly Louise and James (assuming by precedent Charles would want to house all nieces and nephews). Going by the properties used by Beatrice and Eugenie these would be small London bases rather than family homes that the likes of the Gloucesters and Kent’s have.
If William and Kate are planning on staying Windsor based then it would make sense for George, Charlotte and Louis to be Windsor based as well.
So given that none of the children of the Gloucesters or Kent’s are in funded royal apartments that kind of suggests to me that the old plan of retiring Kensington Palace could be renewed.