When lightning network and schnorr signatures come online (LN should be out before 2019 is done) the scaling issue for bitcoin will be largely solved with maybe some tweaking for micro/nano transactions for streaming money applications. Then the rest of the unbanked world will have the same advantages as the rest of the banked world.

I think the parabolic curve needs to take into account the negative effect that bitcoin/crypto has on being an equity drain exit from the system. John McAfee may indeed be right in stating $500K+ / btc. At that point, when various crypto also become a stable store of value and reasonable medium of exchange, values will be posted in bitcoin rather than dollars because the value of the dollar will no longer be stable (hyper inflation).