The iPod is a proprietary integrated product, although that is becoming quite modular. You can download your music from Amazon as easily as you can from iTunes. You also see modularity organized around the Android operating system that is growing much faster than the iPhone. So I worry that modularity will do its work on Apple.
If you understand cause and effect, it brings about a set of insights that leads you to a very different place. The knowledge will persuade you that the market isn't organized by customer category or by product category. If you understand the job that consumers need to complete, you can articulate all of the experiences in that job.
I don't feel that this concept of disruptive technology is the solution for everybody. But I think it's very important for innovators to understand what we've learned about established companies' motivation to target obvious profitable markets - and about their inability to find emerging ones. The evidence is just overwhelming.
Managers are already voracious consumers of theory. Every time they make a decision or take action, it's based on some theory that leads them to believe that action will lead to the right result. The problem is, most managers aren't aware of the theories they're using, and they often use the wrong theories for the situation.
The Republicans are wrong in thinking that the rich create jobs. In reality, many of the richest Americans have been investing in efficiency innovations rather than to create jobs. And the Democrats are wrong, because growth won't happen if they distribute the wealth of the wealthy to everyone else.
Companies, in fact, are specifically organized to under-invest in disruptive innovations! This is one reason why we often suggest that companies set up separate teams or groups to commercialize disruptive innovations. When disruptive innovations have to fight with other innovations for resources, they tend to lose out.