Can the PS4 keep its 50% Market Share even if the NX is included?

[Intrinsic]

When the NX is released, will Nintendo still be supporting the wiiU? or manufacturing WiiU consoles?

If the answer to any of that is No, then why still include the WiiU in the current gen market share chart? Isn't that like putting a PS2 in the same chart with the PS3/360/Wii?