Being able to harness kairos rather than letting it slip away is the difference between a successful piece and a piece that gets lost in the hustle and bustle of the world. News sites try to hold onto this kairos by linking (hopefully) relevant articles at the bottom of headline news stories. They realize they need to take advantage of the situational opportunity in order to make their smaller stories get the views they need to stay in business.
In fact, when you think about it, many businesses, especially those whose success depends on page views, rely on kairos. Take YouTube for example. They have employees who are entirely dedicated to tweaking the 'related videos' algorithm in order to supply the most rhetorically relevant videos to the viewers in order to 'strike while the iron is hot,' to get them to watch just one more video, to get one more ad shown.
Kairos is such a universally relevant element that is used everywhere, even if we may not consciously think about it. We have to know when to talk to get the largest impact, companies must know when to present their products to customers to get the most viewership. Kairos amplifies your message, letting it reach a larger more receptive audience.