I've heard people refer to it as 'the reckoning' lol when btc finally gets replaced. Total speculation though on what will happen and exactly when. Could be less than 10 years off, might be longer, who really knows.
From what little I've read about it btc is a pretty poor crypto currency. Slow, with high transaction fees. It's popular because it was the first and has maintained that dominance.
Will be interesting, I hope to see what happens when the cryptpocalypse comes to pass.