When people realize that much of their gold portfolio is tungsten, fractional reserve, or stolen, then they will see that Bitcoin is 100% verifiably genuine.
and how would they find out? and if so when? I don't see why gold can't be indefinitely detached from it's 'real value' as long as 1) it has some centrally decided spot price 2) most of the people holding gold only hold paper gold (a promise of future gold) not immediate delivery. And I don't see either of these things changing.