Microsoft's the main choice, and even if Linux overtakes it the similarities between MS' Office suites and free alternatives like Libre Office, at least as far as word processing goes, are enough that most users would have little or no trouble adjusting.
QWERTY's not going anywhere either; most touch interfaces still use a classic QWERTY layout similar to a physical keyboard. Even if voice dictation software makes some large leaps in the near future it'll never be perfect, so knowing your way around a standard keyboard is a must.
My brother's school has implemented Acer tablets into the curriculum as visual/interactive learning aids and such in a variety of classes, though student access to them is still pretty limited. They're certainly not using them for any office/IT training, though, and I doubt they will be in the future.