iOS is built from Mac OSX. IOS and the Mac OS are slowly merging (Lion, Mountain Lion) so OSX could in theory work with touch screens in the future or now. I wouldn't say "never".
Many customers have been asking for an iPad...
Why hasn't Apple released basically a Mac AIR without a keyboard but with a touch screen?
Basically a iPad with the Mac OS and file system and not iOS?
Would seem easy to do as they've flattened the AIR so just remove the keyboard,...