It is possible, that Satoshi is/are reading all these bitcointalk contributions ... and although some pepole want him/her/them to come back, nothing happened.
I guess he's not reading anymore but it probably he is only checking the market trend.
Tell one good reason why Satoshi should come back. (good reason = improvement of Bitcoin)
I don't think there is a need. People had already accepted that the creator has been gone for many years and maybe, he had just been forgotten. If ever he got back, that would be the time to show in public and tell his story and that people know who he is. But doubt it can be done as he tends not to show it rather keep anonymous till he dies.
With his contribution, I think it was enough. In fact, the only we wanted to change is the instant transfer nothing else, I think.