There's no call to action. Someone (including myself) will open the email, realize there's no immediate call to action and be like, "Ya I'll get to that" and nothing will ever happen.
Also, without something like the proposed citizenship with karma points and such, there's no good way for an automated system to suggest someone to turn it over to .
Why it has to be automated? What's wrong with actually having some mailing list or other community forum and discussing it there would could be the consensus maintainer?
If it's not automated, it requires to much additional effort.
It is worth to do for really big projects which can't be developed without community effort, but not for smaller ones which almost work and only require small fixes from time to time.
Also on such projects people don't know each other, and don't know how much everyone have contributed, so there's no way to have meaningful discussion and consensus.
