BTC flippening gold doesnt really mean anything. Markets always go up and down and gold will find its luster back again as soon as theres bearish sentiment in the traditional markets around the world. Gold has always been one of the safest investments for thousands of years. That wont change flippening or no flippening.
You are right no coins will replace gold. It is a universal asset. And where you go in this world it has value. And all over the world, it has investors. You are right this is the safest investment for thousands of years. Bitcoin is now entering the market, and it is gaining more investors but it won't flippening gold.