At current growth rate Bitcoins will each be worth over $1M by 2018. This would imply being worth 3x all of the gold ever mined.

https://www.reddit.com/r/BitcoinMarkets/comments/7hvj8e/dail...

If Bitcoin becomes the most valuable asset class in the world by two orders of magnitude (in 2020, assuming same rate), lots of crazy other side effect will occur.

Bitcoin isn't going to keep growing this fast. It'll go parabolic for a while, and then settle at a midpoint between where the rally began and where it peaked.