Well I have read the Thread and I"m thinking about the ultimate end game.
This is what I know about Bitcoin;
It is traceable if someone observes the movement from the ISPs, so not absolutely anonymous, but you can always use TOR.
The Canadian government has a Bitcoin clone: MintChip... it's ready to roll, this tax announcement is the pre-emptive strike; banks can't stop something backed by the Canadian government, FINCEN will have to take this into account. MintChip is legal within Canada for paying taxes. If governments wish to extend their life, they will have to build their own Bitcoin clone for their territory.
Centralized exchanges are traceable and must report their transactions, so capital gains will apply to people exchanging their bitcoins.
Since Bitcoin is untraceable by a regular business(ISPs can track it) it can only be taxed by the business, this will eventually create a business location taxation scheme, F the source of the cash, our resources were used to make it, and these businesses fall under our jurisdiction; There is no way around this. Bitcoin is unstoppable, and can only be controlled at it's choke points, businesses.
Bitcoin transactions between people cannot be effectively traced so only at these choke points can it be taxed. Declaring your Bitcoin income is quite easy when you are being paid in bitcoins, the government knows you got paid and will take their taxes off at the point that you earned them.
Decentralized systems built on top of Bitcoin cannot be taxed, they are automated systems built on code, but sooner or later you have to buy food from a business, so you will pay taxes off your p2p Corporation income in the jurisdiction that the business is located.
This creates an incentive for governments to build infrastructure to support and increase the efficiency of the businesses that fall under their jurisdiction to provide the resources they need to maintain their income from taxation, e.g. Better roads, Fibre optic cable to reach the most remote areas of their territory, better power infrastructure to facilitate the movement of physical resources. This will create a resource based economy.
The system that will eventually be created is one where governments are determined to allow their citizens to make a living so that they may receive the taxes from consumption; Businesses too must purchase resources to grow, point of sale taxation. This will eventually slowly but methodically increase the running efficiency of the governments themselves by forcing them to limit stupid and useless laws creation, they will have to begin running the government as a business intent on increasing their citizens purchasing power,safety and health... can't tax you if your dead.
you may wonder what if the people begin to use Encryption Networks(TOR) or Decentralized systems(classifieds,ripple), maybe even 3D printing hubs?
Encryption Networks: Can't, taxed at point of sale.
Decentralized Barter System:e.g. Kijiji; No taxation possible at point of sale; can't be monitored. but resources consumed can be taxed;
3D printing: Taxation of resources extracted from the territory
Combined system using all the above: Taxation only possible at point of Recycling or Mining extraction(orbital satellites, surveys have mapped most deposits on the planet) Eventually home extractors will make resources 100% recyclable... end of governments as we know them, taxation impossible, regulation impossible open source governments will take care of infrastructure, security, and health of the population. The collective will decide the fate of humanity.
End game if p2p begins to rule the planet, end of all modern corporation/governments/systems as we know them; Resources will be distributed on a need to extract basis, the scarcity of the resources will determine what you are able to print on your 3D printer, The collective of a jurisdiction will decide what to built and when if the resources are available, infinite growth of the human race... The Golden age of Earth begins.
Yup I know long... but thinking long term. I might be wrong though, there are always selfish people who will find a way to dominate others in one way or another... we could build a blockchain for that too.