Dr Christensen wrote in his book that you have to compete with your own products before someone else comes along and disrupts your market & profits. It's a no brainer but it's a difficult decision for most companies because most incentives aren't aligned with destroying revenue, making your products obsolete, ... Dr Christensen explains the dilemma and he offers solutions. Nothing's perfect but Steve Jobs may have solved the dilemma. Steve's decision was to basically kill the iPod with the iPhone and to kill the Mac with the iPad. You can still buy iPods and Macs so you could say nothing got killed, but you probably wouldn't be able to pull off decisions like that in big companies because they have well-embedded risk-averse corporate cultures. Note: I don't mean to imply it's all about the culture.

The entire book is written as case studies of industries that this actually happened in. You could possibly argue that the problem doesn't apply to all industries, but its pretty hard to state that it flat out doesn't exist.