This always happens when the price is in a downtrend...The ones stuck in fiat who missed the rally from $100 are trying to get others to panic and sell so they can buy bitcoins for cheap...
Some of them are trolls and just want the attention...best to ignore them...
That is the main point of people when they are saying that bitcoin is dead. If you do not know bitcoin well the sudden changes on its price may cause you to panic and think that bitcoin may stop on developing and it may gone or at the same time die on its price and process on the market. But as I have said the process of development also needs the decentralization or the down movement of the price of bitcoin in order to make a move on developing its transaction, price and its security features.
You are right here but the prices of Bitcoin is not falling down even it is being increased day by day then why people think that it will be dead or it is dead. There is no proper point to say so bitcoin is just moving a upward. And so it depends upon supply and on demand. So its demand is increasing day by day for sure the supply of Bitcoin is going down with time. For sure it is going increase in future. People should look at its price then should say something about it is either alive or dead.