DVD-RW is rewritable, too.
Still have a couple of hundred VHS cassettes (the media was never really cheap, IMO) with music footage - guess I'll convert some of them to x264 files before the video/audio signal vanishes; gotta love VHS chroma noise.
DVD-RWs are more expensive then DVD-Rs, so they haven't any place in today's broadcasting industry, at least over here.
In this sense VHS was cheap, (and enviromental friendly FWIW) because you could record it over and over, for preview purpose obvioulsy.
The solution would be a wireless world in wich the people involved in the production could download from the company's server the rough working editing. BUT, since the editing suites are connected only to a local net, because of virus, and a true broadband is a mirage, I produce dozen of pieces of plastic every month, that usually are dumped.