A couple of reasons. First as others have mentioned IBM still needs the lines. IBM's processor design is fairly integrated. It needs custom circuits which really on their fabrication technology. Their chip design process is the antithesis of fabless development. So they can't just shut off lights to the fab without crippling the Power, Mainframe, and high end storage business for years to come. The other issue is there are customers getting chips manufactured. If you shut that down there are typically very steep contract termination fees. This is really 6 year wind down with higher costs every year. The fab business is very cutthroat, you have to hit fairly high yields and have the line near full capacity or else you lose a boatload because the fixed costs are so high. They've been getting out of this business for years, especially on the low end. This is just the last step.