U forget there's a huge market of 1.3billion Chinese ... inside China these customers purchase goods with Yuan, above post i said '薄利多销' for overseas export business, for local market there's another words called '出口转内销' 1.3billion market also can spend many 'Made in China' goods ... Before world economy go for better, China just need '薄利多销' & '出口转内销' to drive 2015 GDP. Anyway the lower Yuan will kill many developing nation's export trade without competitive goods with 'Made in China'.
Just recent days visited Super-market here, i saw many '出口转内销' goods selling in Wal-Mart & Carrefour. Maybe this time 'Made in China' earn less but still can sell out.
The problem is that, which China have 1.3 billion people, not all of them are targeted overseas customer. On average, a middle class Chinese earn somewhere about 17000 USD (100,000 RMB) per year, that is significantly lower than middle class in the west. The Chinese market is big, but not all could digest foreign goods.
Domestic goods does not change the currency value, basically it's still within the same cash flow model, and that too could face saturation.
Indeed the lower Chinese currency would kill many developing nation's competition edge, but at what cost? Do remember, it's a double edge sword, while it kills off foreign competitor, it also kill off domestic competitor, and what China going thru is what the West had gone thru in the past, take mobile phone maker for an example. In 1990-2000, there are 10+ major Mobile phone maker (Nokia, Motorola, Samsung, Sony, Ericsson, Apple, LG, Segam, HTC, Alcatel, and Siemens, just to name a few), how many of those are still in business? China today, have more cell phone maker than the world used to have, and that would much like all these 10+ major phone maker, will be slim down to 2 or 3. But the only different is, while those 10+ are all over the world, all these Chinese Phone maker are within China, so, say 70% of those have to close down would mean quite a disaster for China.