What his proposal/prediction amounts to is a "P2P tax". Everyone would be taxed according to the amount of possibly copyrighted data they exchange. These taxes would be used to finance the artists, who would be paid based on a random sampling of how much their works are shared.

If encryption technology makes it impossible to tell what data people are sharing, as appears likely, then everyone will be presumed to be sharing copyrighted data all the time (just like the blank tape tax is charged assuming that everyone will use blank tapes to record copyrighted data). So all that is needed is simple metering of data from ISP to customer. The user would be taxed based on this amount.

I agree that it's a plausible future outcome, if DRM software doesn't work. A content tax on all data streams is not particularly attractive, but I guess it's better than having no content at all.