Do you think that the increasing population is necessary to retain all the new knowledge gathered from one generation to the next?

This was inspired by this question. I’m wondering if, as we develop new ideas, and more and more people can be masters, just in different subcategories of an art, if our increasing population is the only way to “store” these ideas so the next generation an the next can continue to expand on them. In the context of the original question… let’s say I master jazz guitar and I’m the best at it, but I don’t really know squat about flamenco, someone else is the master of that… and someone develops a new style of guitar and there’s a master of that… no one person holds all the guitar skills to pass on, and more new skills are invented all the time… how else could this be passed on?

I recognize that out population explosion is not due to this, and that it is outpacing the need based on this idea alone.