You will never be able to get past a letter input device like a keyboard. It has to be there or at least available. Where innovation can come is through other avenues of input such as touch, motion, sound, and even expression. But really the most potential lies in how the computer interacts with you and not it; i.e. A.I. There are things I do countless times on my PC but that I have to repeat constantly; for example, producing music, writing a document, and browsing the internet. Why can't my computer index my past papers and learn from them to the point where I can give it a topic and the appropriate information and it will write it for me in a syntax close or very close to my own? Why can't my PC look over my past musical projects and produce one of its own? And finally, why can't my computer offer new ideas of collaboration based on articles on the internet that I have read (refrigerator bed anyone?)?
Obviously we don't have the technology available to where any person with a reasonable amount of money can buy it, but it does exist and it will happen eventually.