It's not like Sony had a real choice. They can't compete with Nintendo without a tremendous advantage in third party support, so they are forced to focus on the regions where they have a chance. Ceding Japan to Nintendo is financially more reasonable than engaging in an uphill battle they can't win. Microsoft realized the same thing after the first half of the Xbox 360's lifecycle.
Plus I think US is actually more biased towards buying Xbox's, than Europe is towards buying Playstation.
This gen, if Xbox had done a fantastic job, but Sony had flopped all over (with games, and hardware, and policies) the way xbox did this gen, things would be dire for Playstation 4, even in europe.
Thus I dont think its wrong that Sony tries to focus their strengths to the region where they do best.
Its like their protecting their base, so that it stays healthy in future.
Necro-bump this 2020: http://gamrconnect.vgchartz.com/thread.php?id=229249
Bumb in 2021: http://gamrconnect.vgchartz.com/post.php?id=9047071