Mini iThing

Why do people make things so difficult?
 
Latest news I’m reading is that the new Apple tablet, iSlate or iTablet or iWhatever, has the “keyboard problem” to overcome. Problem is, of course, that keyboards on little sized devices are stupidly small and are impossible to use by anyone whose fingers are normal sized and decent sized keyboards only come with desktops or normal sized laptops.
 
But what is the problem? I really don’t see it (however, I do admit I have a very simplistic view of the technology world).
 
Two facts are clear. 

1  –  The keyboard needs to be standard sized to accommodate human beings. 

2  –  The keyboard needs to be at least as small as the little portable device it’s for.
 
So invent a folding one, as an accessory, for heaven’s sake. Or even one that can be rolled up – you know, something like the piano keyboard you can already buy, but smaller. A wafer thin, infra red or laser, touch sensitive keyboard that when not in use, slides or folds neatly into a special space built into the device.  In fact, expanding on this idea, the keyboard could fold up in such a way that it could also double as a case for the device.
 
No doubt someone with knowledge will tell me that it’s been done already – in which case, why isn’t it being developed and used and on sale in PC World, etc? Or tell me that it’s not practical for some reason – in which case, overcome the impracticalities and make it work; that’s what difficulties and challenges are for!