98% of pork in China is from foreign breeds of pig raised in China or from meat/adult pigs? If it's the former then a blockade is not going to suddenly kill all the pigs inside China.
They won’t die but they have been genetically cross-bred to degrade over 1-2 generations, which means in 4-8 years the pigs will no longer be viable.
Capitalists are not stupid. When you purchase pigs, they don’t sell you their pedigrees, which are kept in highly secured facilities. They sell you the pigs that have been deliberately cross-bred to the point where they can control the rate of its degradation such that it can no longer produce meat at quality and quantity after a while.
The whole point is to force you to keep coming back and buy from them.
To clarify, I should have said the animals are less viable for meat production, not that there is some “self termination” gene.
https://archive.ph/TKZwr