Something like Loomio is great but even for small servers, it isn't cheap. I think that funding is going to drop off after the birb influx and for instances of more than 100 folks it's $75+ a month.
I do think something like this is a fantastic idea and I wonder if it's something that could be handled without a 3rd party resource.
Great thinking. It's definitely the direction we should be looking in, decisions on an instance by instance basis.