The Queen married a man with more royal blood than her own – a circumstance unlikely to be repeated in royal history
OK, arguable – her Poppa was actually King after all – but take it as true.
The Queen and Prince Philip were both born of royal blood – but none of their children or grandchildren married royals
That’s why it’s more likely in the future. Or, at least, more possible.
The more the British royal family marry commoners then the more likely it is that if one of them does marry into the prince/princess circuit then that incomer will have more royal blood…….