That saves them time and money on the PC port.
Wonder what other corners they will cut in order to save time or money...
I fear that them choosing GFWL shows that either they don't care enough to look at what PC gamers want, which would be not GFWL and Steam instead, thus will be a shit port. Or, they looked at what gamers want and determined not to give that and to instead save some time and money...again, shit port.
I hope I'm wrong, but that's what I fear may happen.
I have it on PS3 though, so I'm good. Granted there are some framerate problems on PS3.
It's a tradeoff. If the developers are given a certain amount of time/money to do the PC port, would you want to risk the potential of running over budget and going past your deadline to do something as significant as replace GFWL with Steamworks, when you have the rest of the game to work on?
Some would probably say, "I wouldn't mind it if the game came out later if it meant the removal of GFWL", but the publisher likely wouldn't see it that way. Namco Bandai will surely want to see an ROI as soon as possible, especially for an investment that rests on the support of a potentially fickle fanbase. From Software would likely want to also get the game out the door to capitalize on the buzz surrounding the PC port.
It's not an optimal situation, but nevertheless, if PC gamers really were serious about wanting Dark Souls on the PC, this is the time for them to put their money where their mouths are.
I have to say, this is reminiscent of the situation that faced the PowerPC Mac ports of AAA titles about 10 years ago; often Mac-PC multiplayer compatibility had to be cut due to code conversion issues going from x86 to PPC, problems that porting houses couldn't deal with given their limited time/expense budget.