When you look at the government, when the government collects a buck, it's not free. They have to spend resources, the IRS, audits, all this sort of crap, to collect the dollar. I'm not assuming any Laffer curve effect here at all. There are just transactions costs of collecting that money.
The capping of cash transactions will help the banks reduce cash intensity.
The first time you went to eBay, you probably didn't do a transaction.
Bitcoin is mostly about anonymous transactions, and I don't think over time that's a good way to go. I'm a huge believe in digital currency... but doing it on an anonymous basis I think that leads to some abuses, so I'm not involved in Bitcoin.
Liberation movements - prizing ends over means - are not always particular about their friends or scrupulous about their transactions.
If you think about any multiparty process where shared information is necessary to the completion of transactions, and the coordination of activity and the exchange of value, that's where blockchain technology can be put to good use.
With private chains, you can have a completely known universe of transaction processors. That appeals to financial institutions that are wary of the bitcoin blockchain.
I see it as very important that taxpayers have access to all financial transactions.