Nah, they can't harm bitcoin.
Those altcoins are trying to surf on bitcoin's wave and enthusiasm. It's thw other way around.
Probably most of hem will just be ignored in a few years or months, as bitcoin has better infrastructure and devs.
I agree with this. This is probably just some acts that will only prove that bitcoin is theost powerful coin im cryptocurrency and no other coin can beat it. At the same time it will probably affect altcoins and not bitcoin. Because we can see that there is a huge possibility that the altcoins user will be torn into different coins. With this, bitcoin is still the king.