Let's brainstorm ways to solve the seeders/leechers problem via cryptocurrency: how much would it cost to encode a complete feature-length film in the bitcoin blockchain? :P
The user would torrent a scrambled file, once some conditions were met the user would receive the mechanism for unscrambling the file. While the user is seeding the scrambled file they would have an alternate metadata that describes that file. The version that is served could be based on consensus of the network.
After that failed he designed BitTorrent to actually align the incentives of users, without any of the currency bullshit getting in the way