By the end of 2003, I rapidly traded the 30mb MP3 player (you had to download a new album every time you changed moods!) for a cheap, 100mb mp3 player from eBay/AliExpress which promptly broke, and then for a rather gangly and expensive unit from Best Buy whose manufacturer I can't recall.
The MP3 player market as of this point was flooded with early, low-cost, incompatible devices made for the computer superliterate, not the typical music lover. Afterward, some years ago, the iPod was released by Apple. Technology had gotten merely good enough and just little enough to provide a lot more power than a few years before, and Apple used that technology to envision where you didn't care about underlying technology or the filenames the MP3 player from scratch and create a music player.
iTunes made it easy to manage your songs, easy to obtain them legally. Apple didn't invent MP3 players or music, but both changed with the iPod.
Right now, the same pattern is unfolding with wearable tech.
There's hardly something cooler under discussion in tech circles.
The Samsung Watch was trendy in concept but flopped. And Google Glass freaks the crap out of everyone I've ever seen see a stranger wearing it. Wearable technology will become primarily a sensor and software game, and wearable gadget is going to trend toward invisibility.