Missing the point
"In a statement sent to Infineon customers last week, the company noted the time and expense required for Tarnovsky to crack the chip."
Infineon's own engineers are surely well aware that they are playing a game with rules of "crack once and its cracked everywhere". Infineon's PR has probably been told as much, but (on the above evidence) don't want to admit it to customers.
So a qualified bloke had to work on it for some time, and needed a few hundred thousand dollars of kit. THEREFORE, if what you are trying to protect is worth more than (say) half a million, you'd be better off using some other device.
Or maybe change your business model? The real lesson here is for investors and shareholders. If a company uses this sort of technology, then there are real limits to how sucessful that company can be before it is worth someone else's time cracking it open. That someone else needn't be (and for legal reasons probably won't be) an actual competitor. It could be one of the company's customers, disgruntled at having to pay over the odds for a product and willing to publish anonymously in the hope that the competitors act on the info.