Just boxes. :P
Unfortunately, all of those companies have grown too large, and have bad leadership. It's too large to die quickly without some major f**kup, and even if they did it would take a while before they admit defeat. As it stands I hope the
NX fails as bad as the Wii-U. For the most part they already lost their primary audience:
Children. Certainly 3DS is still going okay, but it's slowing down, worse is children at an early age are being handed phones to keep them busy, and free 2 play games to occupy them rather than some dedicated console. When they grow up, Nintendo will be this off brand while Sony and
MS are the two competing major gaming companies. Sega is only mentioned in passing every so often anymore, generally with a bad Sonic game attached, they will be about the same.
If Nintendo played things smart they could probably take over the entire console gaming as a whole and do great; And I'd probably prefer them to
MS or Sony as it is.
However that's assuming they were smart and not being royal d**kheads.