As a long time VGchartzer (I don't post a lot but I'm here everday) I can say that that graph is pretty accurate in accordance with my personal experience with the site. There was obvioulsy a huge drop in use in 2010, but I also noticed a recent upswing. I think that what happened with that huge drop was multifold.
At that time the wii started dropping a lot in sales, but this generations console placement in the race was pretty much already set, so interest in sales dropped accordingly. Also around this time was when this website and forum format was changed, which a lot of people didn't like, and many respected long time posters left. Add in the introduction of "vgchartzpro" with the reduction of available tools and chartz, and then a few questionable "articles" which alienated quite a few users (including myself), you get greatly reduced forum usage.
I hope that the upswing continues, and that the website bosses get their shit together before the start of the new generation (when sales interest are at their highest), so that vgchartz can be as great as it used to be.







