In my opinion, the connection I failed to make explicit is how iPod in 2001 related to iTunes as it's hub for digital media.
iTunes was the hub of the last decade for the iPod. This hub was dependent on the traditional PC, but radically increased the mobility, convenience, functionality, and simplicity of how we handle our digital media.
However, these mobile devices became increasingly sophisticated (ie. the iPhone) and the iTunes hub became cumbersome and constricted further growth.
10 years later...
iCloud is the new hub for all aspects of our digital lives. This hub liberates our digital information (if you so choose) from dependence on any one particular device (ie. the traditional PC). This increases mobility, convenience, functionality, and simplicity of how we handle all of our digital information on any number of devices depending on your specific needs.