It might change if in the future they realize it has a following, but I think for now on they have taken the explicit decision to ditch it. The reason for that is twofold, one they put barracks and other RTS-reminding things in Garrisons as if to appease the old fans and they just don't have news about it.
Though I get a sense the main audience would be nostalgia buyers.
But, the main reason might also be it could be pirated easily.