I don't think that's a reason to "fix email". Rather, it's a reason to use the right tool for the job. If you need a to-do list, use an app that does to-do lists well. If you need to keep track of changes to documents, use a version control system. What's needed, of course, is a tool that integrates all these other tools into a manageable workflow. But that's not "fixing email", either, it's just another tool.
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I don't think that's a reason to "fix email". Rather, it's a reason to use the right tool for the job. If you need a to-do list, use an app that does to-do lists well. If you need to keep track of changes to documents, use a version control system. What's needed, of course, is a tool that integrates all these other tools into a manageable workflow. But that's not "fixing email", either, it's just another tool.