One guy writes the motion detectors, another writes the pan-tilt, everyone reviews everyone elses code and suggests improvements. If this were effective today, we could have giant leaps forward. Soon it willl happen.
Historically, groundbreaking scientific work has been done by one or a few extraordinary individuals (Einstein, Watson and Crick), and groundbreaking engineering work has been done by carefully selected groups led by an extraordinary individual (Oppenheimer, von Braun). I don't see how the Internet changes that.