I often see an interesting video, that I would submit if my queue was not full, and I bet others do the same. On the other hand, there are probably some folks that cannot find something they want to post. How about some kind of charity post. A dedicated place where people can place videos for others to post. So when you say 'submit a video' and your queue is full, you get the option to put the video embed code in charity, just like a normal post but you get no credit and anyone else can come along and claim ownership if their queue is not full. It could either go to the queue, or some other place. A charity video would never make it out of the queue unless someone first claimed ownership.

On one hand, this might clog the queue with crappy unclaimed videos. On the other hand, it might make it easier for new people to participate. I assume the the charity videos would have a shorter life span than normal videos, like 1 day instead of 4, if they are sent to the normal queue.