At first I was going to say something like "Well with that attitude we'll never get the 'year of the Linux desktop.' But actually, what you say describes exactly what the Linux desktop is.
It isn't about hegemony but rather a free marketplace of ideas and philosophies that gives its users a depth of choice between desktops and configurability within desktops that you can't find in any other operating system. So with your philosophy the "year of the Linux desktop" has already happened and is continuing to.
In other words it's ok for people quit obsessing over low market-share and instead enjoy their freedom.
Desktop Linux only "competes" with Mac O's and Windows on a superficial level. While it seems like marketshare matters... it really doesn't from a existential standpoint. Desktop Linux has no* financial driver towards greater marketshare. It's not* competing for dollars with commercial, proprietary OSes.
* Not entirely true... there are certainly commercial offerings and financial backing for the ecosystem, though I'm certain it would still exist without them.
Weird to use market metaphors to describe things that are not commodities. Plurality is the key here, everyone free to choose their own software. The "free marketplace of ideas" metaphor implies that there's some natural process determining which ideas are ultimately the best, when really it's qualitative and very subjective.
