How many years before MP3 becomes king?

I was reading about one unit that plays CD's pretty decent, but also stores 300 hours of 128 bit music. It has every type input and output imaginable and could be the world's greatest jukebox.

Sound quality was compared to early CD's played on first generation CDP's. The author wouldn't predict how many years (months) it will take for enough bandwidth and other factors to happen for the MP3 to musically surpass even SACD and DVD-A.