The whole thing is worrying. Avoiding all music not in the public domain, arrangements not covered by copyright, cd-tape-lp etc. not produced commercially, might let the webcaster get through without the levy. Doesn't leave much, does it?
It sounds like regular broadcasters who simulcast on the web would be assessed extra based on net listeners. How many are willing to pay the extra? Non-public stations have local advertisers who don't benefit from net listeners. Public stations are close to the bone as it is.
People who want good quality don't record off the net; quality is mediocre as already pointed out, and there are often momentary interruptions of one kind or another. I had good CD-RW hardware and software and good speakers installed with my computer but after a few trials and hearing the quality, it is not used for that purpose. Wasted money in part. I listen but don't record.

Here in Canada, we already have a rather large levy for this purpose on blank tapes and cds, and soon on disc-recording equipment, etc. It is just a tax grab, because no equitable way of getting the money to the performer or copyright holder has been devised.