Let's get down to practicality then. Touchscreen devices are a pain in the ass when it comes to typing. There's no tactile feeling at all, and you have to face the fact that it can't offer the precision of a mouse. When editing an image on Photoshop iOS on my iPad, I found that using touch wasn't accurate. In the end, I had to settle on waiting to get home and editing the image with a proper mouse on my Mac.
Even with SQL support, I doubt whether businesses will fully migrate to tablets. A tablet just doesn't have the processing power of a desktop. Pardon me if I'm wrong, but using a touchscreen for long hours will be bad for your neck (from looking down at a touchscreen).
Even on touchscreen desktops, I doubt this function will be frequently used because one will get tired from having to stretch out his/her arm to poke around at the screen. A mouse is still far more practical.