I think it’s maybe close to a wash between non-replaceable batteries in wireless headphones dying and cords failing, in my experience at least. The ideal case IMO is over-ear headphones that have a replaceable cord—I have some 14 year old Bose QCs and some newer Beyerdynamics, both of which I’ve replaced the cord on.

Have batteries actually ever FAILED in wireless headphones? Sure, they degrade and charge becomes lower, but I've never had them outright fail. A headphone that lasts my 2-3 hours of commute/daily use is completely useable, even if it's original charge lasted 5 hours.

Cables do fail though, completely. They become unusable.

In my entire life time of using headphones/earbuds since school with the PSP, ALL wired options have failed after 1-2 years for purely mechanical cable reasons. Not a single wireless failed for electronic reasons. The did fail for me dropping them and stepping on them reasons, though.

The difference is I can easily fix a broken cable.

I bought a pair of Philips headphones with a replaceable cord. Instead the jack became loose.

I’ve been using Bluetooth wireless headphones exclusively when I’m portable since 2006 (Sony Ericsson HBH-DS970 represent), with only wired use at a desk and I’ve never looked back.

Of course you can get the Fairbuds which have replaceable batteries.

Hopefully more Bluetooth headphone companies follow suit. Maybe we can even get a standardized battery.