That's the normal life-cycle of a maturing industry, or more generally, new species flooding into a ecological niche (you can see this a recently burned forest,

That's the normal life-cycle of a maturing industry, or more generally, new species flooding into a ecological niche (you can see this a recently burned forest, as waves of different species recolonize it) [1]. At the beginning, the niche is empty and new entrants flood in. The key quality for the first colonizers is to be aggressive, reproduce quickly, and be 'good enough' generalists. However, as the niche fills up, increasingly specialized species slowly push out the generalists. Note that the specialists generally don't try to compete with one another very much (competition is expensive), but create their own niche-within-a-niche. There are always new species trying to muscle in, but the specialists are able to keep out competitors by being the best-adapted for that particular role. [1] https://en.wikipedia.org/wiki/Ecological_succession https://en.wikipedia.org/wiki/Ecological_succession