Bitcoin has all the advantages of digital cash and allows one to be in control of their money. Although involves taking security precautions, it's what makes it such a good currency for the future.
Yes the advantages of bitcoin makes it most suitable and flexible payment system for almost all the sectors.
The gambling and porn industries growth are few example, how bitcoin contributed to those sector's development.
Bitcoin will be the best future currency because you also see that the world is getting more digital and that is nice for the Bitcoin itself.
But you have also to know that it can takes a longer time until it will be more acceptable so that will be nice.