No. We have Bitcoin. There will still be fluctuations of course and we'll probably all be driving flying electric cars but it probably means that a gallon of gas in 2020 will cost about the same mBTC as in 2070

Come on BTC... by 2018 I want one of these badboys... 

http://youtu.be/bpko3CPHonQ

http://youtu.be/ivB6VsjBpZU