This is what Nikon will exploit. Nikon sat back, let Sony develop the market, and when the timinig is right, will come in with a better product. Timing is everything, boysans. This is why Nikon just celebrated its 101 anniversary:
"The Sigma CEO has been quoted as expressing grave concern for the narrowness of the FE mount diameter:
"…the diameter is very small and makes it difficult to design high quality FF lenses … it almost looks like E-mount was designed for APS-C more than FF.
(Little wonder Sigma and Tamron don’t want to spend money on R&D for FE mount lenses, leaving us stuck mostly with expensive options from Sony and Zeiss.)
We also know that a narrow mount diameter is a big no-no with IBIS."
IBM was not the first mainframe maker. They sat back, "took notes", waited to see if the mainframe market was real/mirage, , short-term/long-term. Then, when the time was right came in and dominated with a better product that exploited the weaknesses of its competitors.
There is no size advantage with mirrorless once you slap (the vast majority of) a lens on the camera. So no need to have a "who can be the smallest contest". There is an area to exploit with the Sony mount. Too small. Nikon exploited it. There is a weakness to exploit with battery life if you're willing to be sensible about camera size. Expect a camera with much better, DSLR-like battery life. The camera will likely have in-body stabilization that's better than Sony. Faster/better lenses, better battery life (in all likelihood), better in-body stabilization. Camera might top Sony in video (by virtue of newness...). Sony is married to its mount. They can't, rightfully, come out with a different wider mount now, can they? No. No, they can't.
I'd say that's game, set, match.
Although I am happy with the camera bodies I currently own and am not in the market, I will always support those companies that have served the the photographic community long-term, like Nikon has for 101 years...
... over an electronic gadget/entertainment conglomerate that drifts in and out of markets. I don't want the same company responsible for the Ghostbusters remake making my stinkin' camera. Samsung? Out of the camera market. Casio? Out of the camera market. Panasonic? Probably next. Sony? When times get tough, they're apt to bail me thinks. There's ample precedence for this. Nikon? They'll fight to survive or die trying.
They're a camera maker.
I'm on team Nikon.
https://petapixel.com/2016/04/04/sonys-full-frame-pro-mirrorless-fatal-mistake/