The payments industry is huge and OMG is the leader so far for the crypto space. If we can imagine a world where crypto currency is as popular as fiat currency, then there is huge potential for OMG or a similar competitor. MasterCard is worth $123 billion. I'm not saying I think OMG will reach that level, but it demonstrates that the roof for the payments space is staggeringly high.
More than trying to be similar as MasterCard, OmiseGo should act like a real blockchain project. And I trust its team from my heart. They will do this according to the roadmap. Step by step wtihout making mistakes. Payment is a great industry all around the world.