Probably, most people are afraid of the unknown. Bitcoin as an economic asset is still not fully discovered. His price doesn't rely upon anything and the BTC-market is pretty volatile. It makes a price a bit harder to predict.
Blockchain systems and Bitcoin have a lot of advantages compared to fiat and we can make our life much easier with these technologies. I think we will come to understanding and global using of bitcoin and other cryptocurrencies in common life in the next 5-10 years.