What would satoshis vision be today? Vision on the ecosystem be different? Cross/side chains...bridges? Or more so just very simple economy p2p txs? So no massive amounts of apps/services/games etc? There are things C does well, just like Haskell, and solidity.. I wonder if THEY would ever come to terms with interoperability. BTC, Ethereum, and Cardano (c ,solidity,haskell) have some great things coming along.
Regarding your question and what would Satoshi do if he were not disappeared today he would not stop working on the bitcoin project and w could have had a chance to hear from him and his great project. But in another theory, I think he thing would change because he already done what he wanted to do and achieved the goal and target, other things such as developing the bitcoin project and making it better in up to other developers. However maybe our Satoshi is still between bitcoin developer doing his job.