I don't believe that the world will become so "digitized" as you describe it.What about the poor countries in the third world?Do you think they will become "digitized"?However,to answer your question about what comes after bitcoin.My answer is...nothing. 
The blockchain technology might be adopted in various industries,but all cryptocurrencies will become obsolete.
The blockchain technology might be adopted in various industries,but all cryptocurrencies will become obsolete.
I do think the poor countries in the world will also be affected. Satellites will soon make internet access a global "right." https://www.geekwire.com/2018/spacex-gets-set-launch-first-prototype-starlink-satellites-global-internet-access/
Why do you think cryptocurrencies will become obsolete? What indicator are you basing this prediction off of?