Common sense is probably the way to go on some topics.
Seriously if we compare videogame addiction and its consequences to other types of addictions one has to admit that Videogame addiction is a very very small problem.
That, in turn, may explain why there has been so few studies on the topic and why the scientific/psychologists communities have shown low interest in the issue.

I could compare videogame addiction to drinking, gambling, firearms obsession and of course will find videogame addiction to be rather harmless.
But the interesting fact is that I could also compare it to excessive behaviors related to movies, books and even music and still find that in term of yearly number of cases and their consequences I am facing a very marginal and relatively harmless phenomenon.
I am not trying to dismiss anything, a life is a life, but I am wondering if it is really necessary to always blow things out of proportion...

The guy is just repeating what central marketing at Sony decided was right to say about DS.
I think they are well aware of the success of Nintendo...

In my opinion they should go all the way and actually back up their claim with facts:
Power up the hardware / graphic chip, sort out analog controls (second analog stick seems the most obvious solution) and start releasing FPS and other high production value / adult market oriented games... As it is the PSP is a half boiled piece of hardware, with slick looks, decent but dated graphic capabilities, terrible controls and too few good games.