FreeBSD uses it for the operating system. While he complains that svn is obsolete, he then goes on to say it's widely used, and so far, it seems pretty important when games and operating systems--and more--are using it.
How many percentage of new projects use svn instead of git? That it a much better metric for how obsolete something is.
They aren't cool / widely used but definitely not obsolete if half the worlds financial systems still run on them.
1a : no longer in use or no longer useful
// an obsolete word
b : of a kind or style no longer current : old-fashioned
// an obsolete technology