Whether or not it should happen doesn't answer the question of why it hasn't happened. The fact is that the very companies that do automated processing of applications probably would welcome resume standardization, so why didn't they do it yet? It's in their power to propose a standard, settle on it, and require it.
I suspect the answer as to why it hasn't happened is simply because most laypeople applicants would find it too difficult to do something like LaTeX or whatever other thing would be necessary to make this a reality, and also, firms in general suck at adopting new technology.
> laypeople applicants would find it too difficult
> to do something like LaTeX or whatever
Those people where a CV and certificates matter, they already construct a CV in the closed system of LinkedIn or Monster's websites. Nobody needs to use LaTeX, there will be websites where anyone can do it, if anything that's an additional business opportunity.
No, I suspect the actual reason is: Nobody will do it unless the big players (LinkedIn etc.) will adopt it. And the big players don't do it because interoperability, and a CV that can be migrated anywhere, isn't in their interests.
I suspect the answer as to why it hasn't happened is simply because most laypeople applicants would find it too difficult to do something like LaTeX or whatever other thing would be necessary to make this a reality, and also, firms in general suck at adopting new technology.