It should be done well before the block halving that in current times is going to take place at the beginning of June in 2020. With lightning network being globally deployed we should be able to reach it before the end of 2019.

In other words, $50,000 by 2021 is on the conservative side, and thus we should be focusing on $100,000 to be achieved by that time. It means that Bitcoin's market cap will break through the $2 trillion dollar mark.

Gold currently has a market cap of $8 trillion, and who knows how much of that will flow into Bitcoin at some point in the future. I want to experience the moment when Bitcoin surpasses gold in that aspect. It will happen.