According to this math in 230 years Bitcoin will be worth 1 trillion $. Given that Bitcoin will keep following this logarithmic function make sure you put aside 0.01 BTC in paper wallets and save it somewhere.
This is what heltok from reddit said:
If we assume that bitcoin’s value will be the same, no growth in the US economy and US money supply keeps expanding at present rate, then 1BTC will be worth $1T in 230years.
The source that he used to calculate the money supply is: http://www.shadowstats.com/charts/monetary-base-money-supply