BTC isn't just old. It's a prototype. The biggest cataclysm of all would be cryptocurrency going mainstream. That would be the killing blow for BTC. The only reason BTC is even a thing is because of its first mover advantage.

Take a look at Tx/S and Avg Tx fee. It's theft in broad daylight. BTC isn't even very user friendly. We tech geeks have no problem but for most people it's too much.

Japan's #2 crypto NEM (which is also Japanese for the most part) has been capable of 3000Tx/S Think how easily NEMmwould clear the backlog while providing near instant transactions (60 second block time) or think about Dash and PIVX offering privacy features and 1.3 second transactions for almost 1/ 100 of transaction fee.

BTC is destined to die. The only reason it hasn't been dumped for better coins like Dash,NEM,PIVX is because cryptos haven't gone mainstream yet. Crypto is still the early adopters market.