It is not a popularity issue. If it were, company after company would have switched as soon as they could make it work (office365, outlook online, whatever SAAS they use, none care about their desktop, only the browser, and all major browsers are available on Linux).

From there, popularity outside the organization is irrelevant, internal support and userbase is for and on some version of Linux.

As this would spread, we would eventually see global usage increase and global popularity become a non-issue.