People have always been leaving because of getting tired of the game itself or over individual matters, even in the golden past.
When I decide to leave the game over a certain, limited 'issue', it's a personal thing and doesn't mean at all the game is 'dying' because of it.
Remember the arena caps introduction? MANY players totally went ballistic over it (including myself), creating the largest complaint threads to date... but didn't hurt the player numbers at all. AH reached it's peak long after that. Or the big Gv control system change...
what in your opinion ARE the reasons for the decline in popularity
My
personal thoughts, in no particular order:
-graphics
-more online gaming competition (yes, non flight games are competition too)
-change in player demographics (less diehard WW2 aviation fans)
-UI
-account management
-appearance & functionality of the website
-much less gamers with joysticks available these days
-economy and competition by seductive (but treacherous) 'free to play' games