Yes, there is a lot of doubt, actually. In fact I'd go so far as to say that PS4 doesn't have a prayer of matching those kinds of sales figures. It's sales just within the first few months of launch are not going to maintain at that level over the long-haul. And I seriously doubt ANY of the current "next gen" consoles are going to match even their previous gen counterparts in sales.
Mind you, I am not one of those who thinks that gaming consoles are on the decline. But I am realistic enough to realize that last gen was a bit of an aberration as far as how well ALL three consoles (and even both portables) sold. That was rather unprecedented in the history of video gaming, that all of the consoles would do as well as they did. Usually there is one market leader with nothing else coming quite close at all.
It will not happen again, nor will PS4 likely reach the heights PS2 (which remained on the market well past it's expiration date for the simple fact that PS3 didn't sell well it's first couple years).







