Yeah, but, it's really not going to be. Like, there is absolutely no chance of that, ever.
Even in the very-unlikely world where some sort of decentralized cryptocurrency is used for anything other than scams and drugs, it's not going to be bitcoin, and blockchains existed for decades before bitcoin did.
> blockchains existed for decades before bitcoin did
That's absolutely not true. Bitcoin was the first blockchain like the ones we know today, the idea existed before but no one had implemented it in a decentralized way [0][1]. Bitcoin was also the first to solve the double spending problem. [2]