If the real rate return of investments over any period of time is on average less than simply hoarding the currency (an inevitable consequence of a permanently deflationary economy) your economy is screwed up.
If I'm misunderstanding, please clarify.
(In the unlikely event that Bitcoins ever became widely popular with speculators, then governments will tax or restrict domestic purchasers or exchanges for Bitcoins (they can't and won't be especially efficient at doing this; the US/EU don't need to be to severely damage the exchange value of a Bitcoin.).
Arcane hypothetical edge cases are unhelpful for exposition. It's easier to look at the conventional alternative: everybody in the world uses a means of payment which diminishes in value at a slow but stable rate. Now the average person that invests in production gains, and the average person holding cash is incentivised to convert that cash into something they want or funding the production of something others want. Isn't this better?
(1)strictly speaking we're better off looking at money as a flow, in which case the velocity of circulation comes into place, but a fixed money supply certainly wouldn't induce that to increase....
This statement is wrong, because you measure profits in money rather than value. With bitcoin the amount of money in the economy stays the same, true. However the value of each unit grows as soon as you invest and produce something useful that people want. This means, you may receive back even less than you invested in absolute units of money, but more in value.
Deflation is bad because it makes loan repayment more difficult during both recessions and periods of growth. In the extreme, deflation will worsen recessions and hinder expansions of the economy.
It is easy to think that lending is a bad thing, but let's put it this way: it is because we are able to take out loans (of various kinds) to start businesses that non-wealthy non-aristocrats are able to participate in the market. Too much credit is a bad thing, but too little credit denies capital to anyone who is not already wealthy.
The bigger issue we should be focusing on is not deflation or inflation but rather who controls it. If it is controlled by one player (government) then it ultimately decides who benefits and who loses from it. It is a much more honest situation when market controls it. Once there are too many people taking loans and going bankrupt, then investors stop investing until a point is reached at which it is more profitable to invest than to hoard again.
In any case, the extent to which people are denied access to capital is almost exactly the same as the extent to which they benefit from hoarding.The distribution of capital changes, rewarding less opportunistic and more hardworking people during deflation. Ironically, it's exactly the opposite of what governments in almost any country tell people.
Finally, I would like to add that even though capital is important, it is not the only component responsible for creating value and wealth. Thus, economy would reward not only people capable of obtaining capital, but also those who have great ideas and skills to implement those ideas.
In my view, Bitcoin will ultimately be little more than another way to make electronic payments. Merchants will accept Bitcoin only to immediately trade the Bitcoin units for some fiat currency on a Bitcoin exchange. Bitcoin exchanges will basically be payment processors. This, of course, assumes that technical problems do not destabilize everyone's trust in Bitcoin as a secure payment system (and given that it fails to meet the formal definition of security used by cryptographers, I suspect that this is bound to happen).
By the way I back my ripple credit entirely with bitcoin -- if you can make a payment go through the network to me, you are entitled to it.