I don't get it. Let's sum it up:
- Ensemble Studios are profitable
- They are owned by Micrsoft
- They are producing "Games for Windows"
- They are producing Games for the Xbox360
- They produce quality games
- Halo Wars will sell 2-3 million units (estimated, but everything with Halo in the name will sell well)
- Microsoft needs strong first party developments
Why the hell should it be closed?
Imagine not having GamePass on your console...