People hold onto ideas they are familiar with. Worse, however, is we create a cognitive bias that what we know is right. I am continuously reminded of Upton Sinclair's comment - "It's hard to get a man to understand something when his salary depends upon his not understanding it."
I believe these two combine to manifest what Bucky Fuller (Author of "Spaceship Earth") once stated: "I am enthusiastic over humanity's extraordinary and sometimes very timely ingenuity. If you are in a shipwreck and all the boats are gone, a piano top buoyant enough to keep you afloat that comes along makes a fortuitous life preserver. But this is not to say that the best way to design a life preserver is in the form of a piano top. I think that we are clinging to a great many piano tops in accepting yesterday's fortuitous contrivings as constituting the only means for solving a given problem."