Regardless of what happened in the past. No one expects China to agree to the court's decision. No one. Not from the petitioners. Not from the court's judges. This is another point that you guys missed.
The PCA is not there to issue judgments so someone else would enforce it. The PCA's mission is to listen and issue its opinions based on laws, history, precedents, and arguments. It does not care if the petitioners obey its judgments or not, and enforcement is left to the governments.
What make the PCA's judgments valuable, whether a judgment is obeyed or ignored, is that in referencing a judgment, one side uses it to support its claim for while the other side uses it to criticize against, all sides tacitly acknowledge that there is an international opinion on how to maintain inter-state order and stability. No one sane expects China to agree to the court's judgment. No one needs even %1 of cynicism to know that China will publicly denounce the PCA.
But this is what will happen if China resorts to violence in objections to the PCA...
Since everyone, including your China, pretty much admitted that there must be some semblance of international order and stability, and China being a permanent member of the UN Security Council, a body whose existence is about order and stability, China will be publicly condemned and vilified when lives are lost at Chinese hands. China's allies, including Pakistan, will offer only mealy mouthed verbal support, nothing else.
Do you know the meaning of mealy mouthed ?
- avoiding the use of direct and plain language, as from timidity, excessive delicacy, or hypocrisy; inclined to mince words; insincere, devious, or compromising.
Pakistan will not be that 'brother' you guys been mindlessly repeating. China will be alone.
Then when an alliance of Asian powers, including Australia, enters the SCS in force to contain China and make sure the SCS remains the property of the world, China will be all alone. Putin might say something Putin-esque, but Russia will benefit with a free SCS, so Russia will stay out of the fray. Pakistan ? Meh. Nothing Pakistan can do, let alone will do.
China can ignore the PCA, but if China does not respond militarily to enforce Chinese claim to the entirety of the SCS, any public declaration of disregard for the PCA will be cast aside. No military response is essentially an obedience to the PCA. That is what the world will perceive. If China respond militarily but become contained by superior might, the world will see China as defeated, hence China ignoring the PCA is meaningless.