iPod sales have been on the decline for a while now and Apple’s long-rumored iWatch might be the gadget that finally kills it. MacRumors directs our attention to a new research note written by Susquehanna Financial Group analyst Christopher Caso, who thinks that Apple is angling to have the iWatch eventually be a complete replacement for the iPod as the go-to gadget for music fans. “We, however, aren’t assuming a material impact to earnings from iWatch, since the iWatch would essentially replace the iPod in the consumer portion of Apple’s product lineup,” Caso writes. “While we don’t expect Apple to discontinue iPod for some time, we also don’t expect an iPod refresh this year, and believe iPod could post year-over-year unit declines as a