It's a strange feature of an economic system where the incentives require that successful participants blow themselves up. It requires that new=good and old=bad.
What is more surprising is that our attachment to institutions includes for-profit businesses. Really, we should, as customers/consumers, just go with the best service, but culturally we can't help but think that something is lost when an old, useless company goes away.
Ultimately, in the context ans scope they are made, they are probably great decisions. However, reality is more far reaching.