I believe some are looking at it, Canada and the UK both were looking at creating one (independently). I believe Canada started, who knows where that project is at though.
There would also have to be some sort of ageing of the data in whatever is accepted, the blockchain needs to truncate at some point. Major corporations aren't going to accept any currency that keeps a transaction record forever. As a VP of one of the major FinServs said to me a few years ago "I don't want any data I don't need, and the second I am not required to have the data that I need, I want it gone."
As for those who distrust central banks, well, they will never be happy with any currency that can get true global adoption. Even Bitcoin, for the most part, has lost them to coins that try and obfuscate the transactions.
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