I agree that the central banks will use their govt. minions to draft laws that will probably try to co-opt, limit, and otherwise control crypto-currencies. That being said, the whole point of cryptos IS the fact that it's - in theory - not possible for them to be manipulated. Of course, technology is always changing and odds are that someone, somewhere will be gotten to, a program or new quantum computer will be able to hack one or more of these crypto-currencies, etc. Who knows? Like a good idea who's time has come, I think they are here to stay - as long as there's the internet.