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One obstacle, absence of a standard for digitalized currency. To flow across jurisdictions or systems. Networks, repos, etc. If you want to use money transacted in one of the use cases to do something somewhere else, you need the interoperability of cash.
Common Standards - holy grail - some notion of local standards with the ability to bridge them with some interOp. We do have in standard legacy processing. Intermediate legacy systems handle it for now. If we have blockchain, local blockchain, how do we park between blockchains. What about the middleman? How does it work with current systems? How do we get from where we are today to what we intend?
How do we get assets into the blockchain, in the first place? If in digitized form, easy. Those not digitized, not easy. The scramble to digitize actual cash (JP Morgan) to have cash on the ledger.
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Some updates made in the taxonomy document and others.