I don't have all the answers about how a new economic system might work, but some possibilities I can think of include:

- New cryptocurrencies (possibly built on smart contract platforms) could replicate some features of the banking system

- Some loans could be based on deposits instead of new money creation (i.e. the naive view of how banks work)

- Easier creation of equity instruments based on crypto tokens could substitute for debt financing

One thing that fascinates me about all this is the ease of experimenting with new ideas. I don't know where we'll end up, but I'm optimistic that this messy process will end up advancing civilization.