Does this mean that you wont be following Nigel Short's repertoire now?
Unfortunately, as a 1500 i am in no position to answer your question, however you will notice that the Dragon's sub forum does appear to be fairly quiet. Also, one of the guys who had done much of the posting here, Bragesjo, now apparently plays the Caro Kann instead. Although, he recently played it against a GM with a reputation in the Dragon circles and almost came out on top. (he also seems to be a really nice bloke from his posts and you could probably get some good advice from him).
I would think that it is nowwhere near as popular anymore as other lines in the Sicilian and so there is a good chance that white players will not know the lines as well as they do in the Najdorf etc.
I also think that most of the lines are fine for black outside of the Yugoslav stuff (Levenfish and g3 setups etc). Key problems are probably still in the 9.0-0-0 and 9.g4 lines of the Dragon so if you look at those and find lines you are comfortable with you shouldnt have too many problems.
Not sure at 2300 level but against people 1800 and below most favoured 9. Bc4 lines of Yugoslav (probably because they knew no theory and it seemed logical) which although dangerous is probably not as much as the other two lines. It maybe that people play this because they have a simple idea of what they are trying to do, without knowing the theory. It's a fairly thematic opening which is part of the fun of learning it (at least at lower levels).
I would say give it a go and see for yourself how well 2300 players know it.