PSP Go not ready to go where is the touch screen

You would think sony would get it by now that it would need to keep up with the times and correct things which were wrong with the original PSP. Why o why in the world would they not make the PSP go touch screen. I mean you still have to peck at a virtual keypad to type. Why not move into the next gen like everyone else has guys. I like the idea of a smaller more casual version of the PSP, but Sony if you truly wish to capitalize now would have been the time. If this system came out with a touch screen it would have murdered both the iphone/ipod and Nintendo DS. Too late now Sony but maybe next time or version (Stop wasting peoples money).