So tell me what changed in AH2 that make the player numbers gradually drop between 2009 and 2016.
The only major thing that changed was the free to play world of tanks and world of warships. I know about 10 or more players that left AH and play there, or still have an account and fly FSO but never in the MAs.
I outright refuse to play world of tanks and world of warships. It's just not fun for me.
My opinion is the drop in player numbers begins declining after that junk hit the net. And they still do heavy advertising on TV.
I do remember in 2009 around our peak in numbers, military channel and history channel aired AH commercials.
Advertise and they will come is best solution. IMHO