I must confess... I have on more than 1 occasion looked for touch screen monitors. They're pretty overpriced though.
But there are times when I wish I could use a touch interface on my desktop as the nature of the work flow would improve. Not always, in fact seldom, but there are cases.
But somehow I doubt that I would get what I wanted.

All we'll see is more games and "apps" and web crap. It will be a while before computers actually get a seriously usable interface that integrates different input methods. The key will be voice, which is so locked down right now that it is completely unusable by anyone except the largest software houses/vendors. e.g. Microsoft, Samsung, Apple, Google, etc. Nobody else can realistically use voice because the model is so completely broken and skewed against innovation. I've ranted before about voice. Same applies, but worse. (I've been working on voice for a while now, and get to peer a bit deeper into the abyss than most...)
Anyways, for Metro or whateverthehellitscallednowbecauseofsomeassaninepatentcopyrighttrademarkipbsnonsense, I can see situations where it would be nice to flip between the two.