It is difficult to say with any certainty which currencies will make it out to be mass adopted. I wrote a paper on inflection points for businesses and explained that when more resources come into the space the faster the technology will grow. Thus, businesses will have to continue to adapt their own philosophy and approach.
So, as more companies enter the space the more companies that will not succeed.
RE: How Do We Get the World to Adopt Cryptocurrency And Why it is Imperative We Do?