The original article was spot on about the plastic used to make the jewel case. I have dropped them onto a carpet from just a couple of feet and they have cracked or the hinges have broken. Yet plastic containers which was designed for one use such as food containers can be dropped from 6 feet onto concrete without damage.
I very much doubt MP3s are going to suddenly go away. Even if the codec is removed from phones, tablets and computers sometime in the future then why would it not just be a matter of downloading an application or codec to play them back? Heck my Linux Mint install was able to play Amiga SoundTracker files out of the box without me having to download anything extra.