The fallback idea is a somewhat smaller scale possible game. While labeled the fallback, it is in essence approaching the game from the other direction - rather than multiplayer first, it will be campaign (still with multiplayer support) first. It will instead focus down on playing more like Brothers in Arms in the following ways:
It may have the following elements of X-COM:
The fallback is a lot more friendly towards procedural content generation.
Most definitely players of tactical shooters because of the focus on first person combat in the most effective way possible.