What about those of us with boxed copies of FO3? I really doubt I will play FO3 again. GFWL wasn't used as DRM for FO3 though. It was there only for achievements and to sell DLC. I used an offline GFWL account and never once had to connect to GFWL (it was even blocked in my firewall). Other than the little popup during loading telling you what key to press to open the GFWL overlay, I didn't notice it there.
On my second play I had the GOTY edition and modded it. Using FOSE and the 4GB patch disabled GFWL anyway, so I had forgotten it was a GFWL title.