I'm examining an awesome report prepared by World Pay, and there are lots of informations about the future of payments. I advice you to check whole report but i want to add considerable points to here.
Below slide answers the question "which payment method will become the most popular in the future?"
So, we can clearly realise that e-wallet's will be leading the payments industry by 2019. And here is the global payment methods breakdown.
The rest of the information and region/country aggregation can be found at full report. I can repeat that it is awesome.