Bitcoin does not deserve to be called dead, but it might be true if one thinks that it will be replaced by other currencies in the future. I don't know if it will really happen in the future, but nothing is impossible in this world. So far bitcoin is the first in the order of the most valuable cryptocurrencies, but in the future there is no guarantee that bitcoin will remain the same due to market competition and developed technology.

So please don't call bitcoin dead, it's really not worth saying. Being replaced doesn't mean death, losing its price doesn't mean dying either.