you need to understand that Bitcoin isn’t “crypto” , it only looks like crypto on the surface. That’s why no other crypto can really threaten Bitcoin.
Bitcoin is crypto not on the surface but on its core because it uses cryptographic functions to strengthen its security, privacy and decentralization. The whitepaper and Satoshi Nakamoto does not mention cryptocurrency but the structure of the Bitcoin protocol security is highly dependent on cryptography just like any other cryptocurrency reason why it falls under the umbrella of cryptocurrency.
Will a new, better form of money appear one day? Probably, because the evolution of money never stops , it’s only a matter of time.
We are on the same page here. I also think that Bitcoin will be replaced by newer financial technology if it fails to evolve in the future.