Duncan - as a non-technical person my concern is that e-cash, if it becomes too successful, could weaken the core appeal of Bitcoin i.e. its fixed supply.

I did a quick bit of research and found that Calle has already discussed this in a Citadel Dispatch (25 minutes and onwards). Some notes:

Slow-rug risk: printing e-cash which is not 100% backed by Bitcoin.

Some solutions (not yet perfected, but being worked on):

- proof of liability databases

- automated bank-runs

- integration with a federation so the user is not trusting a single e-cash operator

{Note: I post what I find interesting at a particular moment in time.}

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