Interesting article from Brian Armstrong. Definitely well worth reading if you enjoy thinking long term:
https://nakamoto.com/crypto-in-the-2020s/Among his predictions:
Privacy. In addition to scalability, I think well also see privacy integrated into one of the dominant chains in the 2020s. Just like how the internet launched with HTTP, and only later introduced HTTPS as a default on many websites, I believe well eventually see a privacy coin or blockchain with built in privacy features get mainstream adoption in the 2020s. It doesnt make sense in most cases to broadcast every payment you make on a transparent ledger.