Things might be more complicated than just blaming ActiVision. Just look at this game:
http://www.madminutegames.com/
It's a strategy game about the Civil War and is made by enthusiasts. It's got a entire modding section on the site explaining things in detail. There is no indiciation that they plan to forget support after a single patch. These guys love what they made and they want to share it with the community. Now here's the catch; it's published by ActiVision. That makes you think, doesn't it?