2. For some types of games I would agree, but for Fallout, I think the PC player base is much larger than you would expect. Moddability is a big thing for a lot of us PC types, plus this franchise has fans from before xbox existed.
Just thinking this myself.
Though interestingly the other day I checked the world stats for achievments "I was bored", and the drop off rate for the quests in a linear fashion was staggering.
If you also look at the amount of forum users now days, and even considering the new CoD came out shortly afterwards.
The shelf life of NV has seemingly been poor, even for pc.
The DLC may attract some more people back and the patch even more, but if it is bad, we may see modders as the only "dlc" makers in the future.