I'd wager that Tencent would actually be the most likely company to buy Nintendo.
To those unfamiliar, Tencent is a Chinese internet services company similar to Yahoo or Google, but is pretty involved in a lot Chinese PC gaming. Tencent on its own is worth over $130 USD.
They of course want to expand in the West, and I think the Nintendo brand could help them really kill it.
Tencent happens to own Riot Games, makers of League of Legends...
I predict NX launches in 2017 - not 2016