Once you get Clank down to about $25-$30k, I could see a lot of people buying one just to have a slavebot. $10k-$12k is when the middle class gets them.
If you think the middle class is prone to buying $10K toys, you're either very poor or very rich. We don't even hire a cleaning lady, and we're solidly middle class.
fully-automated production-line process isn't quite viable.
The reason we don't fully automate things, even moving assembly lines where full automation is conceptually trivial, is robots are horrible at dealing with even mild unforeseen events. Fully automated assembly lines tend to suffer very expensive, catastrophic failures when one thing goes wrong, which is why we've actually slightly reduced automation from its peak.
One of these robots, assuming it works, should be able replace three shift workers over the course of a day
Just looking at this robot, I wouldn't expect it to handle industrial 24/7 work for more than a few days without things breaking. Its delicate, tiny servos and actuators would all be shot. Building something similar, but industrial grade, would be 5x-10x more expensive than Optimus (as industrial-grade tools tend to be). An industrial robot,
like this one, that stacks things on shelves and does literally nothing else can cost around $60K. A humanoid bot that can stand on a line and run for thousands of hours (a year is just 8,760 hours hours) without being serviced? You're looking at $200K+, easy, and that's extremely optimistic.
Then add in other issues. Optimus moves slowly. It has fragile, articulated fingers. It's unnecessarily expensive because a humanoid shape doesn't naturally balance upright. The first Optimus lead has already left Tesla to found his own factory robot company, and he's
not building humanoids.
If the actual expert in robotics who led the project has no faith in this sort of design, that should tell you something. Musk isn't an engineer, and his ideas for automating manufacturing and increasing productivity have pretty much all been failures.