The length of the article, and the sheer amount of optimism, leads me to think that this is an elaborate April Fool's article; hence, I'll spare it a particularly lengthy response.
Moreover, the gushing over project Natal is pretty premature. I'm betting that it largely gets relegated to casual games that won't make much of a splash. After all, who're the 360's main gamers? Are they the likes who go for things like Wii Sports? No, they'd rather play Halo 3 ODST, Gears of War 2, and Modern Warfare 2. What will Natal do for them? The Wii didn't sell on the gimmick its controller did... It sold more on price. And Natal won't help there as it basically asks owners to shell out another $100US for what is essentially a gimmick they won't use all that much.
As for sales numbers, in order to snag the #1 spot in overall sales, Microsoft (or Sony) is gonna have to somehow counter what that graph showed all too well: Nintendo held the lead for a LONG time. It'd take several years of holding a HUGE lead in the month-to-month market to simply catch up; currently, the gap amounts to around 30 million consoles sold, or nearly all that Microsoft has sold since 2005. So in other words, if Microsoft kept the same average rate over the future, Nintendo could decide to up and stop producing the Wii TODAY, and Microsoft likely wouldn't catch up before the 8th generation of consoles came out in 2012-2013 or so.
Of course, Nintendo isn't going to say "turn off our money printer!" Rather, I'm guessing that, as previous parts of the graph have shown, occasionally Nintendo meets a dip in response to a spike from someone else; then this goes back to "normal." Further, I should run the numbers through an analysis program, but even a quick glance shows that while the Wii seems, over the long term, to average to a slowly downward-trend, so is the Xbox 360, which is trending downward at a speed that seems FASTER. It's the PS3 that seems to trend upwards.