What if Satoshi emerges and says something like: "The coin that's best following the values I stated in paper back in 2008 is Monero. So I would be glad to join their efforts and continue to strive for real money". That moment, Monero would shoot about 100x and Bitcoin would be buried. Not so impossible scenario if you ask me.
SN already did as NS
https://cryptonote.org/whitepaper.pdf
also:
Crypto may offer a way to do "key blinding". I did some research and it was obscure, but there may be something there. "group signatures" may be related.
This cryptographic signing technique is the predecessor of ring signatures as applied in Monero.