Dev team need money.
You have a nice Su-26 ingame, and your game engine supports really nice some small airplanes flying with good performance and visuals, in small maps. MP too!
Why not think about some official Air Races series sequel? Just need to create some simple maps, circuits, some new objects and not so hard C stuff...
People can hit me now with sticks and rocks, talking about "resourses", but i'm a huge WWII air combat sim fan, and love to ride the Su-26 too!
To me sounds like an "easy" way to make more money, using few resources, and creating an amazing product with a new and maybe expanded potential market...
And i believe you already think about that...