[crazygringo]

Coalescing into 2-3 major competitors is natural in the sense that consumers can't, and don't want to, keep track of 10 or 20 different choices for the same thing. It's just too much. It's the paradox of choice.

There's nothing inherently wrong with "oligopolies" except when they collude together to raise prices, and competition is weak. But that's obviously not the case in office productivity software -- competition and innovation are intense, and there's zero evidence of price-gouging whatsoever.