1. You can do what I did and take the WII as an outlier and show that the trend of Nintendo console sales has constantly been a slope.
2. You can do what DarwianEvolution did and state that seeing thus trend one can also state that Nintendo console sales are dependent on the competition
3. You can do what Rol did and state that Nintendo choosing an unconventional path with the NX will lead to a huge boost for Nintendo console sales.
The OP's content was my take on the data and the User's content are there take on the data. At the end of the day they're all correct until proven incorrect.
I asked a question at the end of the OP for a reason, I wanted to hear everyone else's take on the data.
Edit: It seems like the first line I wrote got combined with your post, just for clarity sake.
I know that I can't expect much from a sony famboy like you but at least try to be less of a hater.