Bitcoin will always be number 1 and no one denies that because it is obvious, we don't need to give unnecessary examples to prove what no one disputes.
It will continue to be number 1 in blockchain industry and cryptocurrency market until there is a first ever altcoin succeeds to do things like "Killing Bitcoin" and becomes a first ever successful "Bitcoin killer". I don't think I will witness such an mind-blowing and Bitcoin-killing altcoin in the near future.
I don't even believe that will happen, let alone in the near future. As long as the crypto industry exists and no new better technology is created and competes with it, I don't think any altcoin can surpass bitcoin.
It is safe to say that in the era of cryptocurrency, bitcoin will always be number 1 and it is very difficult to change that. Because bitcoin has achieved an extremely strong position not only thanks to its advanced technology but especially the loyalty of an extremely large community. Breaking the community's loyalty to it is not easy.
Bitcoin will only lose its status or appeal unless a new technology comes along, just like how it is beating and attracting more attention than traditional monetary systems, imo.