While BitPay is currently adding between 500 and 1,000 merchants every single week, the company is seeing unprecedented growth. With widespread bitcoin adoption becoming an increasing topic of discussion, Pair expects to see major merchants accepting the digital currency a lot sooner than people imaging today adding that many of them are looking at it already.
That's a pretty decent growth rate! I think that merchant growth is already self-sustaining even without any further marketing efforts.
If any big names enter bitcoin growth will accelerate very fast. However credit card companies are still not out of the game - they have a lot more capital in background and well established brands.