So what? Let them be destroyed.
I'd rather sacrifice some jobs than watch gigantic media conglomerates take over the computing industry and destroy our computing freedom with their DRM. There is no other way for them to enforce copyright in the 21st century so that's exactly what they'll try to do. They won't rest until every computer available to the public is locked down like a video game console. That will of course spell the end of playful hacking as Hacker News knows it. Not only that, this sort of control over what software our machines may or may not run will be a stepping stone towards greater governmental control over key technologies such as effective free software encryption, paving the way for total population surveillance. Non-essential jobs are nothing compared to these important issues.
The copyright industry wants to sell what's essentially huge numbers to the public. That's how ridiculous copyright is. It's the 21st century, the age of information. Instead of worrying about job destruction, better to abolish it straight up so that people will be forced to figure out a new business model.