Since they're both lossy formats, in the next 20 years time, will those formats become obsolete in favour of lossless formats? Especially when data speeds become faster and iPod's become larger in storage capacity? If so, what will happen to those who have huge collections of paid MP3's? Will we just have to re-buy everything all over again? This bugs me a bit, because I have like 30GB worth of music in MP3 and AAC, and I've re-bought my CD collection as AAC, as CD's are becoming pretty much obsolete nowadays... so will I have to, in the next 15 years or so, have to buy all my music all over again?