We are witnessing the real danger of troll posts in the comment sections of articles: Forum threads that are made with good intentions, but are actually not much better than what they try to refute when it comes to the details.
Thread title should have used the verb "will" instead of "could." The GB breakdown in particular is terrible; the GB with its Color revision spanned two generations, not three, because the GB launched in 1989 when the fourth gen was already underway. That kind of mistake is hardly better than what you've been trying to refute, because the guy that led you to making this thread claimed that Switch is in the same gen as the Wii U and 3DS, and comparing those three to the Wii and DS shows a decline for Nintendo. But Switch is gen 9, so it constitutes growth over the previous gen.
Anyway, the full picture here (article comments and this thread) made my head hurt.