Well we already have this, it's called Spotify and Apple Music. I collect vinyl and I rather like having the whole album to listen to without paying anything more. If I had to pay per song which is IIRC the RIAA proposal, I would be less likely to explore music. I would stick to only music I can be reasonably certain is going to be good.
Wouldn't a pay-per-song scheme destroy independent bands so that only the biggest and most shared get listened to?