I completely agree this could be a very useful tool for time saving which could be beneficial in many aspects.
I think it could cause a lot of problems though if not 'setup' with strict, clear and concise parameters.
1.In team settings would every player on 'forfeiting' team have to push their 'concede' button?
2.What if 'concede' option is clicked accidentally? In any setting.
3.Obviously in a standard game it would take everyone's acknowledgement but it only takes one person with a false vision of grandeur and resilience to not want to 'concede'. So if others attack him and not the leader just to ixnay his vote, is that ok?
Just shooting from the hip these are the first three things that popped in my head. I do like the idea though.