[citation][nom]sliem[/nom]Touch for desktop computer is stoopid. Touch is only for tablets and smartphones.[/citation]
Touch is also for desktops with OSes optimized for touch, strangely enough.
Touch is great for environments that will see more casual use, which is why it's great for tablets and phones, as you mention. In a kitchen, LR or BR, it's also likely to be used casually, driven primarily by media consumption - pictures, music, videos, recipes, browsing, etc. In the event that you need to clack out something substantial, there's nothing keeping you from having a wireless keyboard/mouse in a drawer nearby. As homes become more networked, touch screens will play a larger role in home automation, too.