This time should the happiest time of the Doctor's life, as he has never been so normal and not alone in any other place (though he doesn't look as intelligent as in other places and time, but that's part of being normal.). By the way, if Dinky is really Derpy's daughter, I wonder whether the Doctor is the father or not (I hope he is because that will make his life here perfect. And it is possible because Timelord can regenerate into any appearances, so this may explain why Dinky is a unicorn.).