Sure the rhetoric of traditional systems is about "perpetual growth," and there is some truth in that because technological changes do allow for various kinds of ongoing growth - but there is also some smoke and mirrors going on too in terms of the various kinds of manipulation that goes on with the monetary attempts to direct rewards and punishments, somewhat outside of the free market - and surely, I do believe that there are some roles for government because I do believe that there are some public goods whose usage and enjoyment are not going to get resolved voluntarily (or through the free market). 

Whatever the various dynamics, I doubt that it is fair to characterize it as cancerous, unless you are anti-human, but I do believe that bitcoin does provide a lot of incentives to reign in a lot of the excesses and the sloppinesses around money - and the seemingly perpetual debt system that many of us believe to be out of control, even though some BIGGER players say publicly that they believe that they can keep it sustainable (yeah right...  )  Bitcoin may well NOT fix everything, but surely it remains part of our future picture because it is going to be a provide a transitioning vehicle that may well take another 20 to 50 years for the tougher parts of it, but those of us who are investing early into bitcoin (financially, psychologically, skills and knowledge building, and perhaps other ways) are likely to profit quite handsomely for our early involvement as a kind of bonus side-benefit in terms of being recipients of a likely greatest wealth transfer ever witnessed in humanity - even while nothing is guaranteed and we cannot really know details of how all of the bitcoin related matters will play out - beyond speculation based on knowns and unknowns.