It would be the equivalent of doing an EMP strike by detonating a nuke above a city, but worldwide... it would be bad, lots of casualties from lack of energy.

I do believe we are in urgent need to have some way of printing all code, including legacy of basically any consumer and industrial program, because were it to hit, even with everyone today surviving and writing in plain text what they know, we'd be lacking decades of software, that most modern day programmers would have very little idea on how to emulate, at least quickly enough.