John McLughlin's Digital music opinion

I liked John's post about the affect that the iPod has had on him and would even go as far as saying the I'm sure most of society would agree. It's funny to think how quick our society is evolving and fast we are coming up with all these new technological discoveries. The question I'd like to ask is if the cassette tape replaced the record, and the CD the cassette tape, now the iPod is replacing the CD, how long will the iPod be around?