By the time George is King, he will be very much in the minority, as the other heirs to European thrones in his generation (Norway, Sweden, Spain, the Netherlands, Belgium) are mostly women
I suppose, if he wanted to revert to the old thing of royalty marrying royalty, at least it gives him plenty of choice!! 
After all there's a long and sad history of "outsiders" marrying into the British RF being miserable, though George's parents do appear a notable exception (emphasis on the "appear" since we can't really know)