In short - volatility, insfrastructure and user experience.
These long addresses should be replaced with something user friendly. I can't believe I haven't made a mistake for half an year when transacting.
Volatility - merchants can't price goods in something that changes 10% in a day. Most businesses have 10-20% margins of profit.
For alts with smaller volumes volatility is ever bigger.
Whoa I really love this perspective thank you for sharing!
I think generally fear of the unknown is also making a lot of people apprehensive - though they are seeing the benefits more and more.