Bandwagon? It's actually just a logical step for computers to take. I'm sure there were people ranting and raving that they weren't going to jump onto the "Mouse controlled graphical user interface" bandwagon in the mid 80's 
Well yeah, but the mouse provided an intuitive interface for actions the keyboard wasn't well-suited for. The touchscreen is admittedly a nice, intuitive alternative for many (but not all) mouse operations, but you still need a way to enter text, and touchscreen keyboards are mediocre at best - anything large enough to type on comfortably eats huge amounts of screen space, and having no tactical feedback just sucks.
I can see the usefulness of this in a smart phone (certainly a better approach than the Blackberry models with three dozen keys the size of micro-M&Ms, not to mention the various terrible approaches involving assigning multiple characters to the normal buttons on a phone keypad,) but when you're using a laptop-size device anyway, it makes zero sense to not have a proper keyboard.