That they will get smaller is inevitable but then we have to accept they do less work. Do we want to? I mean the Queens cousins do a bit but really it is King, Queen, brother, sister, sister in law, son, daughter. After that William, Kate and kids. The titles, Prince and Princess, should just be for children and siblings of the monarch, which they were doing nicely at having until Harry decided he wanted Russian emigre titles for his kids.