Except that they did train younger pilots but as you can see in the DLC mission, the pilots both young and old were pushed aside for drones. The priorities were on drone development. Even in the final mission, some Erusean pilot(s) lamented that the pilots' side of the air force was neglected to a point where no new aces were made.
As for getting the aforementioned aircraft into the game, I wouldn't place any expectation on them, considering the size of the development team. Take them as surprises if they were to come out.