Not at all.All Altcoins are not removed by the Bitcoin.but the shit coins are already vanishes after some time due to project insufficiency .
What you say is the same as me because I also have that understanding and I also have a variety of valuable altcoins, such as Binance, Ethereum, Venus, DOGE and a few coins that have a large number of tokens.
Bitcoin is indeed super power ranked number 1 on Coinmarketcap but Bitcoin cannot remove altcoins that are already on the market because altcoins can also support the price of Bitcoin when Bitcoin Dumps, as are stable coins USDT, USDC, BUSD and PAXOS.
But of course there are also plenty of altcoins dying and drowning in the graves as well as the coin lacks the continued development of its core team.
Lots of altcoins died and I witnessed it with my own eyes and it has become commonplace in the cryptocurrency business.