I think the technology may just be a bit too expensive, and just end up as low-volume "audiophile" speakers...and seeming they said Carver was interested, I assume that it was going to be aimed at a larger market segment.
Problem is it would need special amplification to create the signals needed, unless the generators were in teh speaer unit, but that would addd needless bulk at the speaker end, negating it's size benefits, and making installation more difficult. Next part is the wire specs would be a pain in the something for them, compared to regular speakers.
I think it is commercially feasable, but probably not until the technology gets cheaper.
edit: I can't type worth crap tonight...