If you think that Bitcoin is over just sell all you bitcoins and forgot about it. In 1-2 years when your children ask you, why didn't you buy some bitcoins when they cost less then $1 mln we get back to this theme 
Hahahah, you have a point in that matter pal
And besides no one is forcing him to leave this industry. It maybe for him bitcoin is goodbye, but it doesn't mean he/she can influence other's to hate bitcoin like what he/she feels right now.