Humans are great at advancing technology, but have matured little in terms of emotional intelligence for decades. Or at least, the maturity has come very, very slow, and is not equally distributed.
It may happen that as more mature gamers grow weary of the console wars and drop out of the dialogue, they are just replaced by fresh fanboys (who are now pre-teens) in the next generation.
However, there is hope. One aspect of gaming that I have seen a noticeable increase in quality, range, & scope in the past couple years is gaming journalism (not all of it, obviously, but some pieces from both male and female game writers have really stood out).
Several developers have also expressed interest in, or begun to speak out about the industry "growing up".
It is possible that, over time, better game journalism combined with a wider selection of truly mature games could have a postive/transformative/snowball effect on the industry as a whole, and one day result in a more mature community at large.
Will this happen in a single console generation (if ever)? Fuck no. Not just because people don't change that quickly, but because there is far more fueling fanboyism than just opinionated individuals on the internet.
There's corporations. Marketing. Image selling & identity creation. Certain people in positions of power and influence within the industry are just as guilty of promoting fanboyism as any troll, (though some are more subtle than others) because, unsurprisingly, they stand to gain a lot of money by doing so. (There's also websites that feature things like "The 10 best butts in video gaming")
Personally, I wouldn't care if someone uploaded a video of themselves taking a dump on their most hated console, I would just see it as proof that they're an idiot, probably a bit sick, and best ignored in the future. I'm not really bothered by any fanboyism/brand loyalty that goes on on this site. It's only when it gets really nasty, or sustained & personal that I think it becomes unacceptable.
I don't think any group of people is likely to spontaneously mature; and gamers are no exception.