jajansen,

Why do you assume force and possibly government collusion won't be involved?

You can't win the debate by arguing that cartels have never existed.

You attempted to construct a strawman and say that if cartels don't use force or government collusion, they are unstable. And I agreed and said the cartel attack would thus destroy Bitcoin if the community creates an altcoin that is resistant to this attack, i.e. rendering the outcome unstable for the cartel in agreement with you. But that does not invalidate the attack (as it stands against Bitcoin and clones). And it would actually require the free market to create an altcoin that is not vulnerable to this attack.