The problem is that Dell is road kill, and that is the fault of Michael Dell, as well as Kevin Rollins, the board, and everyone else in Round Rock and the far-flung outposts of the empire who bought into the idea that what they were doing was somehow right, special, and not replicable.
The core of Dell's problem is in the way they think about their business. Back when Michael was selling cheap PCs out of his dorm room, he came up with strategy to make computers as cheap as possible by squeezing all of the inefficiencies out of the supply chain. Dell's efficient supply chain and the way they squeezed those costs out is what people began referring to as Dell's unique business model.