Many have said and I will say the same thing, Bitcoin never kills other crypto. After Memecoin and Shitcoin entered the market, the demand gradually decreased, due to which its price became worthless. So it's wise to stay away from Memecoin or Shitcoins. However, the most trusted and popular currency in the crypto market is Bitcoin and has been in the market for a long time. The price of Bitcoin is increasing with time, so there is no possibility of Bitcoin becoming worthless in the future and the price will gradually increase.
Memecoin, shitcoins die naturally by themselves and Bitcoin does not engage in deaths of shitcoins, never engage in any way. It's sometimes hilarious to see many shitcoins that call themselves as Bitcoin killers, self-killed and died nearly quickly after their launches. Their deaths show all facts about shitcoins and newbies must be aware of dangerous death potentiality of shitcoins, no matter they call themselves as either "Bitcoin killer" or "Game changer".
What we are facing right now is a trouble that would not be easy to handle for the long term, and if we can handle how this works, then we could easily handle what situation we can face between these two. Bitcoin will keep on coexisting with other alts, some will grow suddenly and go away, some will stay near like ETH, but it is not going to matter to each other. We need to learn to live with both of these living together without having any issues. What we are seeing here is normal and not a big deal at all.
Bitcoin and altcoins will coexist but there is only an unique Bitcoin while there are thousands of altcoins in the cryptocurrency market and many of them died before many others are and will be created later.
About dead coins: how many cryptocurrencies have failed ?