The loss of productivity is,as many things are, not directly measurable. Mediocre code making it into the codebase and hindering future development and increasing maintenance time, or even being the cause for some ideas to never be discovered, how are we going to measure that? How are we going to measure engineers no longer properly knowing the codebases?

Businesses will wake up when it is too late and the damage to the engineering side of their products is already done. Or perhaps won't wake up at all, and somehow (to their management levels) inexplicably fail.