Leaving Nintendo hardware market would remain at two nearly identical consoles such as PS4/XboxOne, Wii U is a console that is different and provides a different experience and capabilities, as it was in the previous generation PS3/Xbox360 identical consoles, and the Wii was different .
It is much better to have a different console and a greater choice of them, and do not have the same console with the same capabilities.
What do you think, would PS4 been so good that there is no Microsoft and Nintendo consoles?
Competition at a very important, it affects the quality and price of the whole market, the more competition the better it is for users.
Luckily, Nintendo will not leave the hardware business, more likely Sony would go bankrupt and Microsoft would leave the market.
And again, you want Nintendo games, buy Nintendo hardware, its simply.
