I’m betting the Queen is not Happy.
To be sure, they would prefer to continue packing their lineage exclusively with European royalty, but more practical considerations summon, and the European nobility still feels the dread reverberations of the French and Russian Revolutions, and, even more, the less dramatic but more profoundly subversive American.
Kate's nobodyship will no doubt strengthen their position with hoi paloi, but, just in case, since its racial make-up continues to shift, there's always Meghan to fall back on, and as a last resort, if it should come to that, they could always declare themselves to be Afro-European Muslims.