As a counter point, there are always some business oldsters who remain attached to their old technology stack, don't really contribute anything to moving innovation forward, and arrive 5 years after a tech has matured with wisecracks which are technology's equivalent of "If you wait long enough, everything reverts to the mean". Sure, but I think we already know that.

Besides, I am not sure how anyone can argue that the level of churn is bad, considering that it is usually proportional to the volume of new ideas and an eventual winner emerging (albeit not always in a meritocratic fashion).