It is also worth noting here that there is more to this market equation than *just* Tablet vs. Smartphone. Since Q4 2013, Non-Windows Tablets have surpassed the PC (Windows, Mac, Linux, ...) Quarterly Sales Figures. When one factors in devices like the Microsoft Surface, the Fujitsu Stylistic, Motion Computing, and various other Windows-Only brands, said lead of Tablet PC Devices grows further at the expense of traditional Desktops and Laptops.
One doesn't need to crush Cell Phones or even continue exponential growth to be successful in what Jobs described as the "Post PC World" as Oremus writes in his article. Apple secured for themselves what is effectively 35% of a wholly new market over the past 5 years, where they've previously only been selling 5m PCs a quarter. Other manufacturers like Samsung and Asus too have managed to secure quite large cuts of this new market, as have various "crapgadget" manufacturers for what it's worth. (PCs too have crapgadget manufacturers, so that doesn't feel too much like a new development)
The fact of the matter is that pressure from Android and iOS has pushed Microsoft to take some very exciting risks as of late, and as such are now looking like they may again be a legitimate competitor in both landscapes that are being increasingly pressured by the likes of ChromeOS, OS X, Linux, Android, iOS, Thin Clients, People staying behind on old versions of Windows and the like.