There are many successful cases beyond IT. SpaceX built rockets that fly back to the base after launch, John Deere converted their African sales team to Agile. They enjoyed record-breaking sales in Africa, and Malaysian Airport is using Agile to improve the customer experience.
Agile is now in every industry and many products. If your goal is to succeed and thrive in this new economy or perhaps to survive in a competitive market. Agile will be essential to you.
If you're not leveraging Agile, your competitor will. In that case, you will find that you will be facing an uphill battle all the time.
It will be challenging to triumph against a well-executed Agile competitor unless you are more Agile than them.