I am not an old school wow player, I didn't play wow in vanilla, although I truly wish I did. I am not a new school wow player, I didn't hop on the fun train at the start of MOP. Silvio Dante's (Hbo Soprano fame) TV ad back at the beginning of WOTLK lured me and pulled me into realm of WOW. At the time, early 2009, Wow boasted 11million subs and in the following months proceeded to knock at the door of 12million subs. Warhammer, Rift, SWTOR and GW2 couldn't do anything more than put a "slight" dent in Wow's sub base.
So why did Wow go from knocking on the front door of 12 million subs to 7 million subs in a 2 year span? Where did the game begin to lose integrity and quality and spark a very slow yet steady nosedive?
I believe Wow's decline is greatly indicative as well as reflective of the current "horrendous" state of Wow PVP. By no means do I believe PVP is the primary, let alone secondary, interest of the core and/or majority of Wow players. Nevertheless, the manner in which Blizzard addressed issues in PVP in patch 5.3 is amazingly reflective of how and why the interest, respect and quality of Wow in general is rapidly declining.
The video explains when the decline began as well as when the freefall accelerated.