The Linux desktop wars mattered when Linux was the future of the desktop.
Now that the desktop has a much smaller future, and Linux clearly doesn't play much of a role even in this drastically reduced future, it's just that KDE and GNOME really don't matter much.
Desktop Linux is a niche product, and it behaves like one—adoption is vendor-driven, and clients use whatever the vendor supplies.
For individual Linux users, things haven't moved in half a decade or more. Linux is still a mostly complete operating system with mostly working desktops. None of it is very polished (polish, as always, is just a couple years off in the future). Significant time and customization are required to make any stock distro+DE work well, things are generally cluttered, kludgy, and opaque, and for the hobbyist that fits the profile—the sort of person that will actually put up with and use this kind of computing environment—one or the other (KDE or GNOME) is already a clear favorite and this isn't likely to change.
Of course there is also the developer group, probably Linux's largest cohort of "serious" users on the desktop, but they just plain don't care much about which DE is installed. They're much more concerned with toolchains and versions of environment components.
So the KDE vs. GNOME thing is just plain...not that big a deal any longer, for most anyone.
The only possibly interesting development in a very long time is Elementary OS, which appears to have adopted a different philosophy from the one traditionally associated with Linux development/packaging groups. But whether this will ultimately translate into an important operating system and user experience, with its brand that supersedes the branding of the desktop environment itself, remains to be seen.