I think Bitcoin will still be the best and Bitcoin will always be a magnet for all altcoins
Bitcoin affects global markets, whatever happens to Bitcoin will definitely affect the market as a whole.
And this cannot be denied, because Bitcoin has the largest market and is currently the most popular coin, and Bitcoin will still be the best.
But if there are altcoins who want to be independent of course they must be able to defeat BTC and I think that is very difficult.