This is much larger than the US only. Even when USD-nominated mobile payment would finally be introduced in the US, it will be a long time before it is accepted

This is much larger than the US only. Even when USD-nominated mobile payment would finally be introduced in the US, it will be a long time before it is accepted in other countries, especially emerging economies. Also, merchants don't have to jump through any of the bank's hoops to accept Bitcoin. A grassroots initiative like this can allow for global, low-cost, payments from your mobile phone, without needing to wait for slow banking innovation. Right, it is still not a given that it will succeed, but it's much to early to dismiss it...