Not much longer, because there's really only enough room in the world
for a single information medium. Very shortly, television will cause
all movie theaters to close and all newspapers to go out of business.
After that, shortwave (and FM) will disappear. Satellite radio will
also disappear because it doesn't have pictures. Then, in one final
elimination round, television and the internet will have to duke it
out. Then we'll be left with only one medium for information. My guess
is that the internet will win, since it's more 'interactive'.

The question then is, will the internet render the spoken word
obsolete? I say do all the jabbering you can now, because spoken
English will soon be an anachronism.

Steve