While I believe in free speech, I personally think that such speculations are not based on reality at all because the reality is that Ethereum happens to be one of the best functioning blockchains out there a Nd while it has passed through some hard times when the network was congested in the past and people had to pay very high transaction fee, it is far from being finished as the Ethereum fanbase is growing day by day, Ethereum has not realised it's full potential yet and when it does, nothing can take it's price down.
There is not need to panic or to pay attention to a guy like him, it is true that ethereum is going through some difficult times but the developers are doing everything they can to remedy this situation and I have no doubts they will be successful and during the next years we could see a recovery of ethereum that will put all of its doubters to shame.
Just be content with holding your coins until that day comes and if you are not holding ethereum at the moment then be attentive because you never know which day will be the one in which we will see ethereum recovering.