Aren't well-seeded torrents essentially multipath TCP? The main thing they get around seems to be per-flow limits instituted on network provider routers and SPOFfy fileservers, the first being a flow deSPOF, and the second being an endpoint deSPOF. Multipath TCP (though I'm not very familiar with it) seems to be only a flow deSPOF, and therefore only solves half the resiliency domains solved by torrents. Of course, they are no doubt faster to set up and don't require half the world to be interested in something .. both significant benefits.