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:

• The player is in control of a smaller set of units (at maximum 20).
• The player may be outnumbered by large numbers of hostiles in some cases.
• The player will be focusing more on tactical operation of the units they have and less on growing the army or building the base.

It may have the following elements of X-COM:

• The player is responsible for individual soldiers throughout the campaign. While they may not necessarily mean anything individually, individuals surviving missions conveys having more bodies in the next & experience.

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.