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Currency that cant be traced? That will never happen.

It is already happened. Bitcoin.

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Im still not sure how did any country ( USA for example ) let bitcoins be "active" for all this years

Bitcoins are like Freenet or Tor. The extremely aggressive and invasive actions required to take any of them down will result in small gain together with large protests. Decentralized and open source networks cannot be taken down. Probably after all governments have leaned something.

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Only one thing comes to my mind, some strong government is behind it using some project.....

I don't think Bitcoins are this case.

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They're more focused on controlling the Internet; if they accomplish this (and they're always trying) then you can expect a whole slew of prosecuting to begin.

For this to happen, there must remain no single free country in the world. And goatsed internet is only fraction of problems if such events become true.

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since every transaction is public, they could potentially force users to declare their identities so they can be properly taxed. It would be impossible to avoid taxation at that point, unless you resort to trading cash in person again.

Keeping two separate wallets and using one for normal trade and another for doing Silk Road purchases will solve this problem.

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However, if governments can listen in on what kind of traffic occurs on any person's connection, they could tell if youre attempting to butt them out. As of now, we have a right to privacy. If CISPA and all its cousins get their way, being anonamous on the web will be a thing of the past.

Listening to Bitcoin traffic are not telling much. Except from initiated transactions. If getting paranoid, route Bitcoin trough Tor. And governments can listen to traffic right now, in many cases even without court permission. All that these CISA can do is fully legalizing mass surveillance that are happening in secrecy right now.