I think someone will develop a bounty system for desired media. All the data exists already, duplicated all over the world. It just needs to be uploaded to the network. Once the system is proven and the torrent folks realize they can 1. upload their stash without fear of it getting taken down 2. Get paid to upload popular content if they are first to the bounty and 3. Use all that idle space they currently have to farm, I think you’ll quickly see a wave of people from this community come on board. These guys are already paying for downloads from Usenet services, hard drives to store stuff, and all those fancy must-have tracker sites. That all goes away and everything becomes so much easier.
TL;DR I don’t think people will pay to upload popular media. I think a market will develop organically to pay for the upload costs.