As with any proprietary hardware on a GPU it all comes down to third party software support and classically if the market isn't there then it's not supported.
Assuming theres no catch-on after 3-4 cycles I'd say the tech is either not mature enough, too expensive with too little results or (as you said) theres generally no interest in that.
Maybe it needs a bit of marturing and a re-introduction at a later point.