When using mouse, there are several common malfunction: 1. The Wheel to scroll the webpage, 2. The ball for mouse to move its location in the screen by detecting the movement of the mouse, 3. The two buttons to indicate left click and right click. For the issue of item 2, we already see mouse design using light-emission and detection device to replace the ball to detect the movement of the mouse. It has the advantage that it has no moving part so there would be no mechanical failure, but the trouble is it require a medium that suitably reflect the light back to its light detector. Now assume this completely remove the 2nd malfunction, we are left with 2 malfunctions to go. My suggestion for the 3rd malfunction is to replace pressure detection mechanism to indicate the click command from the user, we could use a light-emit and detection mechanism similar to solution for 2nd malfunction(which take blocked stage as normal, and count the time between blocked and non-blocked stage as input); or we could use a electrical circuit that is sensitive to the electrostatic discharging brought by the contact of human finger.(which count the time from this discharge to next discharge).
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