On the flipside though, industrial espionage is a wealth transfer that reduces inequality. I recently purchased tires for my car - I got some Chinese ones that were 1/2 the price of the other tires and the Chinese tires are shockingly fine. I don't know how they'd get the price and quality without benefiting from industrial espionage.
Perhaps something more ideal would be to opensource everything that's been stolen. It'd encourage companies to take security seriously and it would reduce the value of the stolen property.
Lastly, I kind of wonder how much of this problem is due to companies insisting on removing dependencies from certain people / groups. Think of all the documentation people create 'in case you get hit by a bus tomorrow'. When my grandpa worked, it sounds like it was fine to have undocumented things so long as people knew about it (e.g watch out for that machine, it's sensitive to humidity and here's how to reset it). Now, I'm sure some middle manager would insist that the 'operational knowledge' be documented and stored somewhere that becomes that much more lucrative for a thief.