I remember saying that last year, why should we discuss the end of mod servers when we could just get rid of tracker...
I believe this was also discussed earlier somewhere on these forums. If I remember correctly, it was said that they still need tracker to track honor at least, if not anything else. Making they're own system for this would, of course, be possible, but would require quite a lot of coding.
Now you might argue, that honor isn't important either and you'd be right to some extent, but honor is still a sense of accomplishment and high honor still shows you've been around for quite some time. All in all I'm pretty sure you'd have far more people complaining about losing their honor "stats" then there would over the kills stats.