Do We Really Need Capital and Small Letters in this Computer World?

this is a question that crosses my mind every time I am on a Diet Pepsi high and my thoughts are moving  faster than my fingers!!! ...what do you think?... I think no...let's just use all caps or all smalls ... and put 3 dots where we want the reader to pause and think deeper or move on to another thought screen!...i hate having to click the shift button with my pinky!