How much does the switch have to sell to be a success?

[Nautilus]

Being successfuol or not is not only aa matter of selling the hardware.Even if the toal hardware sold is less than 3DS + Wii U, if the software ends up being higher, then it will be a bigger success.If it manages to have secent sales of third party on the system, it will be a bigger success.If it manages to sell more peripherals, then it will be a bigger success.There are too many variables to be sure.

And not to mention Nintendo other safety nets, such as the mobile games(which acts as marketing tools), Films and Theme park initiatives, etc.