Gold will exist in 20 years, BTC not sure
But what will the value of gold be in 20 years?
Gold existed since the dawn of the man. I wouldn't worry of its cost in 20, 50 or even 500 years. Bitcoin from the other hand is around only for couple a years, and if something goes really wrong can disappear even faster.
to happen anytime, it's overdue and should erase all electronic data on Earth. Time to take a BTC backup to a paperwallet. But.. wait..