They shunned nintendo because its last two systems bombed. Sony was on a winning streak so they just blindly bet on them.
About why they didn't move a finger in 2007? I do believe for some reason moving their projects to the Wii was finantially troublesome (maybe they already had a considerable amount of art assets created, maybe they were deep already into design decisions that made the game not suitable for the Wii, shrug). They are very worried about FF13's results and most of his movements in the past years can be tracked to a very conservative approach on how to maximize FF13's profits.
I agree with you their ways are hurting them but at least they can churn out remakes to keep the company alive.








