If you take an iPad and hold it upright in portrait view and draw an imaginary horizontal line halfway down the screen, the screens on the seven-inch tablets are a bit smaller than the bottom half of the iPad display. This size isn't sufficient to create great tablet apps in our opinion.
Well, one could increase the resolution of the display to make up for some of the difference. It is meaningless, unless your tablet also includes sandpaper, so that the user can sand down their fingers to around one quarter of the present size. Apple's done extensive user-testing on touch interfaces over many years, and we really understand this stuff. There are clear limits of how close you can physically place elements on a touch screen before users cannot reliably tap, flick, or pinch them. This is one of the key reasons we think the 10-inch screen size is the minimum size required to create great tablet apps.
Third, every tablet user is also a smartphone user. No tablet can compete with the mobility of a smartphone, its ease of fitting into your pocket or purse, its unobtrusiveness when used in a crowd. Given that all tablet users will already have a smartphone in their pockets, giving up precious display area to fit a tablet in our pockets is clearly the wrong trade-off. The 7-inch tablets are tweeners, too big to compete with a smartphone and too small to compete with an iPad.
These are among the reasons we think the current crop of 7-inch tablets are going to be DOA, dead on arrival. Their manufacturers will learn the painful lesson that their tablets are too small and increase the size next year, thereby abandoning both customers and developers who jumped on the 7-inch bandwagon with an orphan product. Sounds like lots of fun ahead.
