The best course of action is to develop the new system, which is likely heavily socialist in practice, and run it parallel with the old system.

As both run parallel with each other we ever so gently merge the old with the new.

People are addicted to this eay of life and only see the end of the world before the end of capitalism. Therefore we will have to slowly ween everyone off little by little to get everyone onboard with the new system. If we take away the drug now we're looking at a chaotic mess.