So yeah, unless there's no DRM or a very non intrusive form of it, then I'll more than likely be getting it off of Steam.
I chuckled at this since there's ample evidence that Steam is far more intrusive than any other form of DRM, including GFWL. Everything people decry about GFWL, Steam does too, and more.
If we're going to get screwed with an online activation/DRM system, gimmie GFWL any day. Zero issues with it for FO3 as long as you had patience enough to wait for the DLCs to release on hard copies (I did).