Hi Sergi,
Based on my experience developing touch interfaces since 2007, I believe in touch. I believe it will be the future of interfaces and I believe it can be better than mouse-keyboard interfaces. That said, it is not there yet. Now is the time to innovate and get it there so that touch interfaces won't be poor replicas of their desktop forebears. Currently, text entry is a real problem for touch exclusive devices, but there is progress being made on that front. We don't have the answer yet but I think it will be a significantly different landscape in five years. In regards to touch vs physical pointers, this is not as large of a problem as people make it out to be. It is just that our widgets tend to be created for mouse-based interfaces and therefore don't transition well to touch. Interfaces designed with touch in mind can be just as smooth (if not smoother) as mouse-based interfaces. You just have to take advantage of what touch does well (faster, more precise routes; multi-touch gestures; bimanual interaction) and stay clear of things it does poorly (precise touch down, covering the target with the finger).
Cheers,
Jeff