You have to wonder if the Doctor was getting dotty, what with being so dang close to that bodies natural expiry date, the he was making really bad calls which he would otherwise think were boners. besides, I've often mentioned that the Daleks reversed their loss in Dalek invasion of earth of earth "with Time travel" in day of the Daleks which means that Susan was left on Earth to face a NEW Dalek invasion in a briefly dominant timeline... So there was no happily ever after for that Susan. Was there any other other companion apart from Adam he locked out on a strange alien vista and just ran from? And even then he had the decency to dump that idjit in his mums flat in the right era... Sarah-Jane? Adrik? I wonder why Ace left?