Of course there's opinion involved. That's the case for all history lessons. The conclucion however remains: Sony seems stuck at just over 10% market share, which isn't much more than they had with their DSLR effort, and far less than what they stated as their aim back then. That can't be satisfying, particularly after having had the full frame mirrorless market for themselves for several years.
As for claiming to be this or that, like a Nikonista, I'm a gear agnostic as well as a format agnostic. I use digital cameras from Panasonic, Olympus, Nikon and Fuji and film cameras from Nikon, Olympus Fuji and Mamiya, format varying from 4/3 to medium format 6 x 8. In a digital world, I find the "full frame" debate absurd, and Fuji is the proof of that. They live very well with their combination of APS and a cropped medium format. They never intended to go into 35mm, something their representatives have stated repeatedly. The 35mm format is a legacy from film, and even back then it was more of a coinsidence than a result of planning. Leica started using it because it existed as cinema film.
At the moment, I mostly use Panasonic, and I use their cameras because I like their ergonomics. I paid around $400 for each of my last two camera bodies (a GX8 and a GM5), and I'm reluctant to pay more, so a 35mm Panasonic will probably be on wait for a few years. I've done critical paid work the last three days with those cameras and mostly with cheap Panasonic plastic lenses. No state-of-the-art full frame wonder with $2,000 lenses would have done any difference whatsoever for that job.
And this is one of the reasons why the market shares in the camera market aren't likely to change much. People are mostly very happy with the gear they have. The few surprises we see mostly come from marginal players like Panasonic and Fuji, who have enough money in the bank to play these games and who don't risk losing huge market shares if they fail. Canikon will continue to deliver low risk products, and those who find their latest offerings boring should think a bit about what their actual market shares are. Together, they control almost three quarters of the ILC market, and they obviously want it to stay that way.
The new Panasonic camera is great news because it's unexpected, but I don't think it will do much for their market share, other than getting a few converts from Sony and Canon. What could be fun though would be if they chose a non-standard sensor size, like 16:9. That's obviously perfect for video, but would also be a potential digital X-Pan. In that case I might have to eat my words about only buying cheap, second hand camera bodies :facesmack: