I truly don't get this place sometimes.
There's nothing in the original post that digs, slams, or diminishes 4e. It talks about the PFRPG doing well.
The RPG Industry Lack of Sales Statistics Treadmill needs a new belt, 'cause the old one is threadbare & I think I smell rubber burning. Given that Paizo's CEO weighed in on their boards (repeated on ENWorld) & said "this is consistent with what we're seeing" what is the frakking point of arguing about the validity of ICv2's post/article?
I mean, you've got Charles Ryan weighing in as, effectively, a neutral 3rd-party saying ICv2 is a respected source AND that the article says nothing to diminish 4e's success.
The whole cycle of "My data refutes your opinion / My opinion refutes your data" is so very, very, very tired. Seriously, for all the chest-beating & wailing over Edition War crap a few weeks ago, some people should take a long look at posts they may have made in this thread & do an Edition War reality check in the mirror.
It IS possible for EVERYONE to win sometimes.
Back on topic, congrats again to Paizo! May you have continued success, continue to drain my wallet, & continue to expand the rpg hobby.