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.
I also agree that smart phone is a huge help on making bitcoin develop. Why? because as the smart phones develop it means that more wallet and more transaction can be make through bitcoin as it developing also. So t may help people on giving the brighter way to used bitcoin on a daily basis using phone as it make easier and upgraded phone on a future. So as the phone and bitcoin develop it also sure that the internet and security will also develop on a great opportunity of bitcoin to grow.