It is the 1980s and IBM is twice as large as any other IT company in the world, combined. Such was their control and influence over the IT market that every Tech Guru of that time predicted IBM will maintain its monopoly for several decades more. However, IBM lost the war and no longer dictates how this field moves further.
Lack of the feeling or a notion to innovate, and not exploring new avenues in the market made them lose. IBM got caught in a paradigm shift. Their business model was primarily based on their Mainframe computer business. They failed to understand how PCs (Personal Computers) were going to dominate the world and took a conservationist approach of protecting their mainframe business while delaying the entry of PCs for consumers. They tried to gear their products more for small businesses than individuals. What they failed to understand is sooner or later someone was bound to bring it in. Enter two young geeks, Bill Gates & Allen Paul. They whip out PCs into the market and made it available for almost everyone by making it as cheap as possible. The rest is history.
This is exactly how startups are going to change the world. Big corporations tend to lack on Innovation after a certain point of time, and just focusses on being a profit-generating machine. Startups, however, require revolutionary ideas and Innovation to climb up the ladder. It represents the journey from a concept to reality. It happens when a person decides to make his dreams a reality for an extra seven billion people. On a side note, Microsoft is on its path to meet the same end as that of IBM, but a thousand startups are waiting to fill in the gap. And the cycle repeats.