The cost will tend towards zero because competition is intense and there appear to be zero moats and ample improvements from every direction.
If these systems have low costs, that means they will be usable by the broad population and that their utility will be widely accessible.
Industrialization led to iPhone, PlayStation, Spotify, and Waymo.
AI will lead to personal chefs, contractors, assistants, drivers, tutors, climbing partners, ...
AI will lead to people making their own PlayStation games, their own music and streaming services (I already have), their own custom smartphones (a future personal project - vibe hardware). And your robot will drive you cross country on vacation while you sleep in the car.
[1] Not actually infinity because earth [2] has finite resources, but the S-curve will look like it for awhile.
[2] Until the robots leave earth, anyway