I'm afraid that ACE3 is just speculation at this point, but there is certainly demand for it as Bohemia have (rightly) made a sequel to ArmA 2, not ACE2. The ACE-playing community still exists and they want things like fully manual artillery, a detailed wound system and MOA adjustment for sniper rifles; these are things which are not viable without the extra interaction buttons, and they would make the already formidable difficulty curve even more terrifying to new players.
This ticket however, the realistic simulation of armour penetration, would exist in the background and improve the experience for everyone who interacts with tanks.