With each passage of time, human knowledge grows and with that growth, mankind is able to create things that we cannot fully imagine.
Just like bitcoin, right? if the internet hadn't been created Bitcoin probably wouldn't have been invented in my opinion. It's only because of the internet with the technology that we have that Bitcoin was formed and created.
I don't know exactly, because like bitcoin it will be not just a new processing system, it will be a new philosophy. All forms of different distributed ledger which I can imagine are just different forms of the same idea and I think that there will be new ideas, because all economy is changing very fast right now: robotisation and AI make human work less needed and this makes everything changing. Bitcoin is good but it was made to solve known problems of an old system. One day some new progressor will invent a new financial decision for new coming era.