Well, I still have not taken the plunge and bought into 6th Edition. I think I've talked about my reasons quite a bit in previous posts, but honestly, they can best be summed up as follows; Expense and lack of time. That said, I have noticed something curious since 6th came out. Hardly anyone is talking about it.
Sure, there are a number of dedicated sites out there that still publish great material for 40k, and don't get me wrong, they put out a lot of great material, even if I'm not into the game itself right now. The number of sites devoted exlusively to 40k, however, seems to have decreased, and even the 'dedicated' sites like Bell and The Back 40k have 'diluted' their content to include a good deal of material on other systems and miniature manufacturers.
In my opinion, this broadening of interests has been a very good thing for the hobby, in general. I have been exposed to techniques, rules systems, and gaming concepts I would not have explored in my previous focus in 5th edition. But has it been good for 40K? I'm not sure. Seems to me like the transition to 6th edition and increase of Codices in general has decreased demand for such products, even if squeezing more from the individual gamer cushions the blow to GW.
This opinion, however, is largely based on conjecture and perception, and I would be interested to hear other folks' take on the matter.