How will Sony and Microsoft counter the Switch?

[Rab]

Intrinsic said:

Rab said:

Nintendo have the largest install base playing their systems 

Pls elaborate. I'm really interested to hear more on this notion of yours. 

If your not aware of the hardware sales:

Nintendo (Wii U + 3DS) about 74 million (obviously some overlap)

Sony (PS4 + Vita) about 60 million (obviously some overlap)

MS (XB1) about 24 million (no overlap)