I really like this idea. Sure, it would need to be worked out exactly how it could work properly, but the idea is really good. I think it's one of steemit's flaws right now. Most of the content on steemit doesn't lose value to new viewers after 7 days. Being able to re-steem a good drawing or video could keep it monetized for years. Or maybe it doesn't get resteemed for a few months but then somebody stumbles on it and decides to resteem and it goes viral. Would be an amazing feature.