The problem is that thats all Dell does. It relies on one formula for its success. The problem is, according to the article, is that when the company exhausts its one forumla, the company starts declining. It needs to start a new growth platform while it can, as there is no point in waiting. Dell is slowly slipping into decline and if it does not change its strategy, they will lose a lot of market share.
The reinstatement of founder Michael Dell as CEO seems to be a good change for Dell. He claims that although his company's main business strategy will always remain it's best one, he want's to implement other strategies to effectively bring the company back up. This is the mark of an organization being effective.