All of the great things that AH has going for it count for nothing when potential new players see something like War Thunder, which may be an inferior game, but is free and pretty.
Good graphics and Free-to Play mode are important but not the main factor in bringing a new customers into the game in big numbers.
If for example War Thunder had come to the market with only Full Realism Arena with joystick control only their project would have already been dead. Nice graphics and F2P would not have helped enough.
What makes War Thunder successful is a mouse control that gives new players an ability to play the game effectively by giving directions with mouse to internal AI pilot which performs the actual maneuvering. It is very easy to implement and very effective solution to bring the new players into the game.
What was not done well by War Thunder developers so far is that they did not achieve the goal of customer migration from mouse controlled arcade arenas to joystick controlled FRB arenas. Many players had already been hooked by gameplay and actually have bought joysticks but they found it to be too difficult to them to play the game with joysticks and after some attempts returned back to mouse controlled mode.
HTC still has a chance at that moment to implement these things better, if they want to get out of trouble with their shrinking customer base. The following steps should be done:
1) Effective mouse control must be implemented. It will immediately give the new people ability to play bombers and GVs effectively and for fighter pilots will make it possible at least to learn the SA and some hit'n run tactics (with F3 mode with gunsite), but they should always be willing to migrate to joysticks to be competitive in dogfights.
2) After two week trial period a customer should get a clear message that from now on his is playing the game on Free - to Play basis with only early war planes and GVs available. If he wants to get access to the whole planeset he must subscribe.
3) Graphics updates and planeset updates are also important in bringing/keeping customers in the game but not a top priority at that moment.