I see the British monarchy going on a parallel path to that other body with which it is inextricably linked, the Church of England. Since the time of Henry VIII the British monarchy has presumed to rule over this church, with the monarch being its head. The C of E was founded in heresy and schism and rebeled against the God-given authority of the Pope. Most unwise.
The present Church of England is now litle more than a loose association of free thinkers and agnostics which embraces every current trend and heresy. The British Monarchy, whose child this church is, will go the same way.