I would ask the question why not to the statement made in that article.
If an attack has over half the computing power over the entire network, and their goal is to profit and not shut down Bitcoin, they are better served by generating coin legitimately than attacking. This is because mining is less risky and increases the security (and value) of Bitcoin.
Basically how are Bitcoin holders protected against the carelessness of others, or even someone maliciously (although admittedly to his financial detriment) "destroying" Bitcoins?
Purposely destroying Bitcoin only makes the rest worth more. Additionally, Bitcoins are divisible to eight decimal places, so as long as nothing costs less than .00000001 BTC, there is no problem. Bitcoin clients can always move the decimal point over, so .00000001 BTC becomes 1 xBTC (or whatever unit) to make things more user friendly.