With completely wireless earbuds, the rule is: when the battery fails, they have to be disposed of. Not so with the Fairbuds, that allow you to replace batteries in just a few seconds. Combined with a repairable design, the earbuds should therefore have an extremely long lifetime.
I imagine phones no longer having headphone jacks isn’t helping the wired headphones market. I’d gladly use wired headphones if it meant I didn’t need to charge mine or worry about them dying on me. Aside from working out, it’s not like the wire is exactly in the way…