EA Killing Rock Band For iPhone, Game Will Be Unplayable For Current Owners 14 years ago
Apologies for being cynical, but you can guarantee that things will be 'no longer supported' etc in the future.. purely by the planned obsolescence of the capitalist system.
I work in the book trade and while we may see a shift in 20-30 years - certain things will never disappear - coffee table books, most kids books, drawing books etc. "Mainstream" (whatever that means) authors may become virtually exclusively electronic.
Personally I like to look at my bookshelves and what is there - and enjoy viewing others.