Can anybody give me a good reason to keep using older video storage devices?
Sure - for watching any of the content that's never been released on DVD. There's plenty of content that even the el-cheapo "six films on one disc at a ridiculously low bitrate" companies haven't put out there (find me a non-VHS copy of
Invasion from Inner Earth, wouldja? Or
Bobobobs?
The Littl' Bits?) Or simply because VHS is a super-cheap way to get legal copies of movies now that everybody's dumping theirs in thrift stores...
Also, as much as VHS suffers from low quality, DVD isn't that good either. It doesn't progressively degrade over time the way VHS does, but it does inflict craptastic MPEG-2 compression on the picture, and it just gets worse the more footage you try to squeeze onto one disc. (Really, Laserdisc is the way to go.)