Well that's the point isn't it? We've tried pretty much everything troughout the last century, and the only solutions that seem to work in practice requires being reversible in the case of errors.

Ergo, most likely working solution for the 'money of the future' would be something that's reversible. You'd try to get the other advantages of bitcoin in the proper solution, such as instant, verifiable, cheap/free and easily scriptable global transactions - but abandon those that require irreversibility.