What about the jobs lost moving the money around? What about the companies that loose money because they no longer sell armored trucks? I don't really think you gain as much as you say. There no doubt would be some gain, but most of the "gain" is really just moved from somewhere else. You only need to move money around as fast as product is made. anything faster is just convenience for the most part (there is some marginal benefit, but i am not seeing anything as big as you describe.).
That labor capital would now be free to do something productive. It's like asking what about the hundreds of farming, or factory assembly jobs that were lost because of tractors and robots? Bitcoin will essentially free up people that used to dig up and fill in holes, and allow them to do something much more productive.
This is true. Where would people find the time for casinos and drug dealers if they were slaving away at jobs? Let's not even talk about the seedier occupations.