You can get some interesting usage statistics from job tracking websites such as itjobswatch.co.uk. In the source control market, Git is now the most widely used (3461 jobs) with Subversion second (3181) and TFS third (2035). Mercurial is a distant fourth with 268 and just about everything else seems to have fallen off a cliff in the past couple of years or so.
The other thing that Git has achieved is that it is now the de facto standard for source control in a way that no other source control tool has ever been. An increasing number of ecosystems don't support anything else and most best practice guidelines that you find on the web assume that you're using it, or else tell you to switch if you aren't.
I suspect that it won't be long before not using Git will start to count against you in the jobs marketplace, whether you're a candidate or a recruiter.
The other thing that Git has achieved is that it is now the de facto standard for source control in a way that no other source control tool has ever been. An increasing number of ecosystems don't support anything else and most best practice guidelines that you find on the web assume that you're using it, or else tell you to switch if you aren't.
I suspect that it won't be long before not using Git will start to count against you in the jobs marketplace, whether you're a candidate or a recruiter.