A better technology than Bitcoin could emerge. What should we do if someone gives us a better system than bitcoin as a gift and leaves? It performs better than Bitcoin, and it even has the perfect decentralization of Bitcoin, which we value highly. Bitcoin was created in 2009, and now it's 2023. Cars made in 2009 cannot be better than cars made in 2023 or later. What if someone with as much genius and passion as Satoshi is creating a system better than Bitcoin?
You've raised a very good question and honestly I've never thought about this before. Just as you pointed out, the world is evolving everyday, technology is constantly been improved and newer products are developed as we've seen with automobiles, television, aeroplanes etc. However, since Bitcoin came into limelight there have been many cryptocurrencies that have sprang up, claiming to outperform Bitcoin. Most of them have disappear into thin air while some of them are in life support fighting for their dear life. So what I can tell you is that Bitcoin is here to stay and there's really not going to be any altcoin that will outperform Bitcoin.
The reason why other altcoin can never be as bitcoin is because they are just imitation of bitcoin, trying to be like bitcoin that is why most of them ends up becoming a failed project. As far as a new innovation is trying to have the features of bitcoin, bitcoin will always surpass it.
If their will be a new innovation that will be better than Bitcoin I won't be surprised because the world is evolving, technology is advancing it is possible to have something as good as Bitcoin if only creating it will be in a different idea and not as that of bitcoin.