meh, I don't think so. Just because he says that doesn't mean it will go that way. Bitcoin will always have a price if there someone wants to buy and own it. Even if the price of BTC down to almost zero it will go back up again, but yeah its just based on my own opinion I'm not an expert about this though.
It seems to that you are right about that. I do not think that bitcoin is useless because for me bitcoin is worth it. When you started to earn cryptocurrency you will not even wasting your time to work for it. Some people are thinking to focus and stopped their personal work because of it. For sure the one who will call bitcoin useless has no knowledge about that, and it seems that they are people who are against to it.