AH3 will not get any new players.
The game smells of mothballs. The average player age is probably over 40, we had numerous players literally dying of old age.
You're going to Hell!
There is no saving AH - the game has to die in order to rise from its own ashes. The new game must not be AH4, but a new name. It may have all the familiar features of AH, many mechanics under the hood, and a similar core game, but it must feel new and branded as a new game. No 17 year old wants to pay monthly to join a franchise that was launched in 1999 (older than himself!) and play with a bunch of grumpy old geezers.
Not cool.
I don't see any reason to shut down AH. There is a legacy population of old timers who will not play anything else and apparently won't accept anything other than minor tweaks to what there is right now. Leave it in place. It's all just running on boxes in his closet and I bet he could run 50 Aces High on the hardware he has now and has network code so optimized that with the current numbers it is probably only using a small fraction of the bandwidth.
I do think there is merit in considering what comes next. A new project with fresh design freedom, not shackled by an entrenched DON'T-CHANGE-ANYTHING mafia. Good time to consider modern off-the-shelf game engines. Offload the plumbing work to people who specialize in that, so Hitech can concentrate on product specific game-play. It may not be worth it, but starting fresh with a new game would be a good time to explore it.
I may be wrong about this, but I think the AH replacement should go back to its roots - an air combat focused game. Leave the GVs to WWII online and Warthunder. The inclusion of a ground game only makes the game look more complicated, daunting and more scary to new players. Keep it simple and focused.
Maybe you're right, but I personally would disagree with that. I think that is going exactly the wrong direction. I think plane only would be just too narrow an offering for the current market. I think the game needs to be broadened not constricted. I'd add Battlefield level infantry.
It's not 1988 anymore. You can not time travel back to your Air Warrior heyday. The current market isn't interested in your old stories Gramps.
You could do a prototype test with AH without having to build an entire new game to test the theory. For one year, disable all boats and vehicles in all arena and see how it works out.
My dream? Venture capital comes in and says,
"Hey guys, we got $50 mil burning a hole in our pocket but you, WB, WWIIOL have to stop dividing a market so that none of you have enough resources to succeed. We're merging you all.
Bill, get the marketing machine going. Get press make sales. Sell the sizzle!
Dale, figure out how to encapsulate your flight models and interop to a Unity front end and Unity Connected Games infrastructure.
Rats, get some real modelers and redo all your infantry and work with Dale on the vehicles.
Here are wads of cash to get things rolling.
Ready, set, GO!"