I don't know if I would have patience with John, when he says "what's wrong with cash?" and "who is Satoshi Nakamoto?". A bit disappointed Marty did not explain these, could be two sentences - "cash is hard to move, so favors custodians and fractional reseve", and "great minds care about ideas, not about people" ((c) Giacommo Zucco).

But good to see John at least open to the idea. And we need to understand what keeps people from bitcoin, so if this is the goal, it is good idea to not interfere and not try to convince.