The game has not changed. The players have not changed either and that is the killer part.
The players that we have now are the same players from 10 years ago, only they are 10 years older. We get very little new blood - where are the squeekers? Have you heard one on comms lately? I have not. They are not gone - the game is so old that they went through puberty and are grown men now.
The game itself is still great. Technically, it is better than it ever was. However, games like this need a lively community to make them happen. There is no meaningful or very engaging PvE. We as a community are worn out and decaying old geezers. I have been here since late 2001 - yes, that is 17 friggin years! playing the same game - this is how awesome this game is, but there is a limit even to awesome.
Without a fresh spirit and energy I won’t make it to 20 years of AH. The game has not offered anything new in years. Sure AHIII came along and was much needed, but it is still the same game, same content, same players only older.
Oddly enough, AH has no real competition. Warthunder is an arcade. DCS is a great sim, but poor game (furnall arena is the closest it comes to AH). IL2 has some private servers that can somewhat resemble a persistent arena, but that is it.
AH needs a major reboot that include some meaningful new content to apeal to its vetrans and marketed to new crowds as a new game. Joining a game/community that has been running for 18 years is very intimidating to new and young players that were born after AH1 was released!