It might be exclusionary but it's reflexive of Nintendo's reality, they can't try to make the Wii happen again with what the market is now. There's nothing wrong with making something more tailored to a specific demographic, not everything can appeal to everyone even if it is attempted
That said I think marketing influencing the development of the product too much is usually a bad thing, I would hope for developers to simply try to make good games and worry about how to sell it afterward. If you consistently make good things people take notice of this, chasing the next trend constantly is hit or miss