Its not just Bitcoin either, this is one instance where history has repeated itself over, and over. Some people overlooked the importance of the internet as a recent example, which now dominates probably the majority of the populations time. I believe people are cautious by nature, and therefore tend to not like change. Therefore, they stick with what they know, and there's a few pioneer within the world which start to bring the adoption to the masses, until it catches on like a wildfire.