Consider this: how many pieces of widely used, successful software can you name that were truly written by a single person? (Some people might say “LaTeX,” but it’s hardly “widely used,” unless you consider the number of people writing scientific papers to be a statistically significant portion of all computer users!)
Why should LaTeX's success be measured against all computer users? You wouldn't measure a soccer shoe's by it's adoption among all athletes (including basketball players, golfers, and runners).
