Survival of the fittest. I see bitcoin has all the capability to be a fittest. Bitcoin can solve many financial crisis. Many peoples border problems. Many people's saving dilemmas. Many people's banking. These are few example. At least one is enough to be a mainstream money.
It has the capability for sure and I think it can certainly help in some of those sectors you mentroned but for it to go mainstream per se I think it will have to be accepted by many stores and merchants.