Bitcoin and cryptocurrencies have gone from nothing to a two-trillion dollar economy. There wouldn't be as much of a need for him to continue to develop it as an existential money problem, because there are many torch-bearers who can do a better job.

If Satoshi were alive today and not enjoying retirement, I doubt he would be interested in cryptocurrencies full-time but aim to address greater existential challenges using decentralisation. For example, I'd think he would enjoy working with nostr, a decentralised social network that uses bitcoin cryptography methods. There are many social challenges that can be addressed with decentralised technologies like this. For example, standard political voting should incorporate cryptographic verification features.