Will crypto currencies like Bitcoin permanently neuter the power of the state?

No while bitcoin is getting more and more popular it won't be taking over currencies like the dollar or the pound anytime soon because only a small percentage of the population will use it.

Those of use using bitcoin won't put a dent into the state but I guess we potentially have a little more freedom to do thing like buy things form over seas

plus the government still has it's military might.

I hope.

The state's power is being neutered everyday by technology. It is inevitable.