Serious answer: we need a sizeable installed user base so that the cross-platform developers don't leave us behind. I found this article to be a pretty compelling analysis of how dependent we are on "scraps" from MacOS/Windows versions of web browsers, and how the Mozilla foundation might not prioritize desktop Linux if it runs into financial difficulties. The recent Red Hat controversy also reminds everyone of how dependent Linux as a whole depends on financial backing from deep pocketed corporations.