BTC is not only the first coin but it has symbolic value for the entire crypto market, one symbol of the blockchain revolution.
Just like gold, there are thousands of metals produced such as steel, aluminum, silver, etc., which are widely used in daily life. but gold has always been the most valuable metal, still number 1.
So there will be no altcoins that can replace BTC although ETH, Sol, Tron or Xrp... have utilities, applications and technologies that are far superior to BTC.
in the internet world, reputation is important, especially the reputation of an asset, so far Bitcoin is more secure and remains decentralized compared to the new altcoins that appear, even the figure of satoshi is still a big question mark until now. there is no safest and most trusted cryptocurrency other than bitcoin.