Keyboard case

The recent article on the death of the keyboard reminded of something. Why can't we have both? The beauty of a big screen is versatility. Why can't we just slap a keyboard case on a candy bar phone and have no compromises?

It might be harder to do on the iPhone because of Apple locking down the software and actual size but on the Android 5 inch monstrosities, it should be easy enough. Mix a bit of software and a decently designed case and you can turn a Galaxy into a BlackBerry.

So, my question is this. Why isn't there a project for this on Kickstarter?