More and more people are using smartphones thanks to budget friendly mid-rangers, almost anyone can now afford to buy a smartphone.
Mobile payment is becoming more common and it is an opportunity to acquaint people more into using bitcoin . Mobile payment will eventually replace credit cards or at least will make them less mainstream. An example of this is Apple Pay. Bitcoin smartphone wallet apps are to use when you have a transaction, you just scan a qr code and the transaction is done though will take some time to be confirmed.
Agreed, that is definitely the future. But the point of slow transaction is also valid, bitcoin has to come up with something better to cope with it so it can be more popularized in the general people and business world.
I this this could be the only or the biggest hurdle standing in bitcoin's way for now.
for sure that can be resolved in no longer time, and OP's statement really matters regarding to bitcoin evolution if more and more people who do treat bitcoin for their transaction with the help of mobile devices it will be much easier and business owners will start recognizing the system and integrate their business for much faster and easy ways to deal with clients/customers.