I don’t think there will be many Prince / princesses in future generations.
I think that depends on how many children George and Louis have (assuming Charlotte follows the Princess Anne route and has untitled children) and how many royal duties there still is.
If they each only have one or two children I expect they'll be titled as they need to be working royals to help George and his children, similarly to the way the Queen needed her cousins to help.
Currently the royal roll call is HMQ, Charles, Camilla, Anne, Edward, Sophie, William, Kate with back up from the Gloucester's, the Duke of Kent and Princess Alexandra. So 8 full time (down from planned 11) and 4 back ups.
In 30 years you'll have William, Kate, Edward (85yo), Sophie (85yo), George, George's partner, Charlotte, Louis and his partner. So 9. With no back-ups. Plus the wives (assuming they are wives) and Charlotte will presumably have maternity leaves
I've ruled out Charles, Camilla, Anne, the Gloucesters, DOK and Princess Alexandra as working royals as they'll all be over 100.
If George and Louis each only have two children I can see George and his heir looking to Louis children to be working royals as at some point you'll have elderly George, his wife, Charlotte, Louis and his wife, plus the next generation. If that's only George's two kids then they'll be a bit short handed when George's generation starts to age