I think the idea is that Beats expanded the market for $200-400 headphones. Yes, Sony sold headphones in that range, but they didn't sell them to every high school student who wanted to look cool.
No, at that price they sold to professionals and audiophiles who wanted the sound to actually sound properly, not muddy bass overflowing the mids and highs.
Apple definitely bought the brand, not the headphone tech. Otherwise with such a cash stash they would have bought any of Beyerdynamic, Grado, Sennheiser, or the newer entries to headphones like Marshall (the Major is so-so but the Monitor is awesome)
Audiophile pretentiousness aside, the article barely even mentions the actual hardware. Probably bought them for the music service & industry connections
This just further underlines the point that Beats are not actually high-end headphones, but fashion items. As such, they're incredibly vulnerable to changing tastes. In the areas around me, Beats have already plummeted from prominence or popularity among young people and cool people.
I've seen that happen, as well. People who can't really afford it pay a couple of hundred for a cool red B on their headphones, then they wisen up and realize that a cool S is a better choice.
True, but at one stage, Sony almost cornered the market for a specific pair of DJing headphones...until everyone realised they actually weren't too good, but still 'wanted to look cool'.