Oleg, you're going to be like that Hideo Kojima guy who does the Metal Gear Solid game series for Konami. He keeps stopping it but then comes back to do another, then another, then another. I don't know how much of your simulators are thanks to you (because this is a major team effort, and you must have incredibly talented intelligent guys working for you to have such few people responsible for so many areas, and still making them so good) - and so I don't know how the IL-2 game series will go if you retire. Maybe someone to take over.
But hey, SoW isn't even out yet, and 10 years is a long time. Imagine what leaps can be made in technology and how your urge to develop more cool things can be revitalized even more.
EDIT: As for the next sim, if half the aircraft already made.. Battle of France including Dunkirk maybe.

Possibly Barbarossa as it uses all the German planes. MTO also a strong possibility.
EDIT2: After my question on the rear gunners of aircraft like Bf 110, I went and looked around the forum searching, and I found one answer you gave stating that there are plans to make the gunners communicate positions of enemy aircraft to the pilot.