I think about it regularly. There is the Discourse solution that is mostly linear but with a replies button to show inline the replies. There is the google wave

I think about it regularly. There is the Discourse solution that is mostly linear but with a replies button to show inline the replies. There is the google wave solution, if I remember well, that is tree like but more dynamic than reddit. Maybe there should be something hybrid where new answers are shown at the top but can be inline expanded to show the context and the replies, and the tree structure is kept after.