The issue is that some people take adoption as a proxy for quality and assume Linux is then obviously inferior. I'm just pointing out that Linux's adoption rate does not actually reflect on its quality--it is a product of a wildly imperfect market.

There are, of course, many other reasons why number of users is at best vaguely correlated to quality; I'm just showing that in the case of Linux it's even less about quality than in other products.

So the issue is that random Linux detractors care--the sort of people who try to convince all their friends away from Linux and towards the proprietary technology du jour. And, regardless of how "stale" the market may be, I would definitely like to see more Linux on laptops and desktops.