This is just one of the analysts who think bitcoin will fall. The rest, as far as I know, are focused on the further growth of the cryptocurrency market. And as noted here, perhaps his position was influenced by the fact that he is a former CEO.
There's always 2 opposing side. Sad though that this former CEO doesn't understand what he's saying and totally contradicting PayPal's current CEO's statement as @squatter have said. The only reason I'm seeing why he is saying this negative thing about bitcoin is, either he was last to jump the hype train and making statement like this "might" have a effect to the price so that he can enter at a cheap price, or he's quite at lost what crypto is. Well, we are happy in drinking the Kool-Aid right now so I don't give a s*** about this guy. Probably he just wanted to stay at the limelight and get some attention here.