Well, why not. Despite the logic of Jeri's point, it's very much in line with the kinds of charges SOCAN already levies on live entertainment venues and radio stations.
'Twill be interesting to see how they calibrate the charges--and it goes without saying that the ISP's are against it. They're living in a fantasy world that their industry, unlike other for-profit services, should be tax-free.
It would be much more interesting for SOCAN to revisit the matter of how they distribute the fees they charge...I think it's all based on radio airplay now. If they're charging for downloading, maybe they'll be able to get a statistical sample of whose music is going through the pipes, at least via the legal download services.
Not that I have much faith in SOCAN's interest in properly sharing the wealth--last year they came out with a plan that included charging buskers $30/day for a licence to play those Neil Young songs!!!! Talk about ridiculous.