Strategy is hard, execution at the middle-management later is harder.
What’s missing from the story is that PARC delivered on its mission. In fact, it saved Xerox from the fate of Kodak. While its copier business was disrupted by smaller Japanese competitors like Canon and Ricoh, one component of the Star system, the laser printer, replaced the revenues lost from its cash cow and Xerox continued to grow. It also earned millions from licensing technology it invented and, it should be noted, from its investment in Apple.
Original source: The Demise of Blockbuster, and Other Failure Fairy Tales