People keep saying that BTC is dead due to they want to promote the other altcoins, they want to say that Bitcoin are going down to bring up other altcoins in the market. Also, they try to encourage the people to decrease their investment in Bitcoin to support the life of other altcoins in the market.
Yes, that's what only bitcoin competitors can say, who want to destroy it by creating panic in the hope that people will start investing in another currency.
This strategy has become older now and people will never entertain those rumors as they are well aware about the power and potential of bitcoins and surely will not get panic by selling their coins at lower price.