How much do engineers specializing in these systems get paid? I interviewed at a couple of places that do industrial-style systems and in one case, I got an offer that clocked in far below the requested rate (not a negotiation tactic, they declined to revise it), and at another, the recruiter couldn't hang up fast enough when she heard salary requirements.
It's something like the Idiocracy Effect. In Idiocracy, the present-day world's best minds devote all their energy to eliminating hair loss and prolonging erections, eventually leading to a collapsed society. The real world is not too far off. Our best minds are dedicated to improving ad targeting and keeping users in vanity-gratifying loops on social media, while our industrial control systems that literally run the modern world wallow in the 70s.
Everyone has some culpability in that. How many of us yearn to work for the local power utility (or one of their upstream vendors) rather than Facebook, Google, or the latest VC pump-and-dump scheme -- err, I mean, hot SV unicorn? Even if they did compensate competitively, are there enough hackers with a sense of [realism/duty/patriotism/INSERT_OTHER_SOCIAL_VALUE_HERE] to heed the call?
There's definitely a role for some type of regulation or standards here. Industrial controls should be considered vital infrastructure that require serious and immediate investment. A brief visit to Shodan will show thousands of exposed industrial resources, and that should scare your pants off.