So the main point of the article is that China controls > 50% of the mining pool. Is there any reason what-so-ever that multiple companies would ever want to collude and fork it, and thus crashing the value to 0?
That would cause minimal disruption while giving the Chinese government a massive payout. There's a lot of value for China to push that.
EDIT: This would actually cause a hard fork. Any non-Chinese node doing verification would pick up the illegal block and discard it, creating a fork between Chinese and non-Chinese -- with the Chinese fork having the majority of processing power behind it. At that point, you'd just need a Bitcoin client change to exclude the Chinese fork, I'd guess?
But miners don't have the power to cause an invalid transaction to become valid, if they were to insert an invalid transaction in a block, the block would be rejected by the rest of the network.