Once you put unbreakable crypto technologies out in open source, TPTB can possibly filter one protocol but a 1000 others will sprout, because where there is a demand supply will go. (And with steganography and perhaps alternative wireless networks, they may not be able to filter)
The smart fork would enable spending the coins from the destroyed protocol into the new protocol, so it is a continuation of the preexisting value and distribution. TPTB can then play Whack-A-Mole.

The more the government stomps on commerce, the more demand for those technologies.
I don't think they can break the core math quickly. And we'll always be driving ahead towards stronger math. Our community hasn't been organized. We haven't been funding mathematicians.
My goal was to get the snowball rolling downhill. I sense the past tense is accurate now.
Edit: TPTB rely on something not being too popular or co-opting the popular movements. How can they convince the people they are stomping on to prefer their walled gardens and jails? The count on being able to divide-and-conquer or pick off a few from the herd at a time, so the rest of the herd doesn't react. But if you do decentralization very well, then any individual can effect his own choice. One problem with Bitcoin from my view, has been we rely so heavily on network miners being not co-opted and thus the battle over BitcoinXT (aka GavinCoin).