Help the developers to make developments and upgrades into Bitcoin.

I think this is already a good reason why Satoshi should come back but we already know that this will not happen..... or it is happening already but in silence. Either way, helping the developers to upgrade Bitcoin would be the best reason why Satoshi should come back. On the other hand though, I don't think that Satoshi shouldn't come back anymore because there might be a possibility that he/she/they might trace his/her/their whereabouts and it might also cause Satoshi's anonymity to disappear so I think its better if Satoshi shouldn't come back anymore. Anyway, Bitcoin is in good hands already .