The Chinese ADIZ is fundamentally different to other nations, in that it requires procedures be followed for transiting a/c.
The surrounding nations plus USA have immediately defied it, and not been challenged, and thus the Chinese have badly miscalculated on 3 fronts.
There seemto be 3 likely outcomes.
1. Chinese 'relabel' the ADIZ
2. Chinese maintain ADIZ and claim it's working for internal consumption
3. Chinese shoot somebody down.
Option 2 would be the usual Chinese approach, but the cat may already be out of the bag on this one
Chinese Bloggers Turn Fire on China's Military As U.S. Flies B-52s Over Disputed Islands in East China Sea - China Real Time Report - WSJ
Edit: Worth looking at the Chinese statements in detail
ADIZ Will Reduce East China Sea Tension | CHINA US Focus
One section is interesting
"It should be noted that the ADIZ is not a no-fly zone. China has been consistently respecting every country's freedom of overflight as long as they comply with the international law
and can be legally identified by the management of the ADIZ." (my italics)
There is no requirement in International law for an a/c to be "legally" identified if transiting this ADIZ. The "legal" requirement is with Chinese Law, which from an international standpoint is only applicable to Chinese registered a/c.
Classic case of deliberately mixing differing requirements in the same sentence to give the impression of uniformity.