Like this idea. need to find a way to make each channels lockable and sellable then it would be perfect

This is an interesting idea - it might reduce the need to have multiple communities. I may have multiple courses that require a community aspect, however I would need several channels for a course related community. So with this idea it would effectively mean the need for sub-channels (i.e. channels within channels) so not sure if this is possible?

It would certainly make life easier for the end user - to just have one community to visit, rather than having to hop around. As an afterthought it would also require specific notification customisation. For example if a course community was a channel within the main community the user might want to be notified of any posts within the course channel but not the main one. Hope this makes sense...?