Nope. Just see the current scenario Bitcoin dips a bit, altcoins dip a lot only strong will survive.
Exactly, this trend tell us everything and what we exactly needed to do.
Altcoin being a threat to bitcoin is just an ambitious move of every altcoin as they're all dreaming that one day they will be on top. Nonetheless, no one will and ever replace on where bitcoin is. The fact that even a lot of bitcoin fork coins were born, trying to imitate what bitcoin had, they even won't touch the bottom of bitcoin.
Don't get confuse with altcoins, some of them were like a rotten ones in crypto sphere.