No manufacturers are not the ones killing the space. It is people who just engage in religious fervour of just buying things are what is killing this space. The manufacturers are just making stuff because people want those things more often than not even if they're useless, needless or downright have zero upside.
We shouldn't go blaming manufacturers. Portable audio space is thriving and that's because no one is approaching things there with mystique that is subscribed to by many in this space