It is not today that I began to hear of bitcoins death, bitcoin has died so many times and my question is why is it still dying? When we hear the rumor of bitcoin dying, it is may be some shit coin creators wanting to create FUD so that people can leave bitcoin and invest in their coins.
You are right, many Altcoins tried to spread FUD against Bitcoin and will keep spreading FUD but won't succeed.
Altcoiners can call Bitcoin slow for example. But it won't make any difference for Bitcoin because Bitcoin is already established.
Another reason is people who missed out to buy bitcoin at a certain low, they try to cause FUD so that weak hands will sell off and drag the price low for them to accumulate the more.
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Yes, it is a reason because some people missed Bitcoin and are now spreading FUD to get it at a cheaper price.

Such people will eventually support Bitcoin later abfter buying big bags.
Even Michael Saylor didn't like Bitcoin 10 years ago and now, he is bullish.