Vinyl (just like tape) has constant degradation time every you play it because it's a contact medium and all copies have imperfections which is the nature of analog mediums as well. Photography is even worse with duplicate slides and film always slightly lesser quality than the original, or gets a fungus, has a color shift, or on old movies the sprocket holes get fragile and break, a big mess.
Digital is always an exact carbon copy of the previous copy, no degradation whatsoever unless the medium becomes corrupt or you purposely use lossy compression to make copies. Therefore, as long as we can maintain the technology used to reproduce these digital images, movies and music we'll always have premium copies with every copy, not old scratchy sounding records or spotty looking movies.
The downside is that if we lose the technology, all copies are lost, unlike a single book or picture that degrades over time, you lose the whole collection in one shot.
FWIW, who cares anyway as we'll all probably be dead and buried long before the fuel crisis hits that causes civilization to collapse and people will be too busy fighting over scraps of food to worry about whether they can play an ancient DVD.
[edited by: incrediBILL at 8:56 am (utc) on July 5, 2007]