Yes, many jobs that were once performed by American workers have been lost due to the advancement in robotics. Robotics are becoming the norm in surgeries as well as factories. We should be concerned. There will come a day when robotics and automation will have replaced all jobs that were once done by humans. Retiring from a factory job will no longer be possible.
A 2013 Oxford study concluded that 47% of US jobs are threatened by automation. Driverless cars effect a whole host of industries from agriculture to shipping to mining. Self checkout machines and apps like those used at the Future Store will make cashiers obsolete. Kiva systems are eliminating jobs in the warehouse. Rethink Robotics' Baxter robot will displace millions according to creator Rodney Brooks. The Momentum Machine can make hamburgers better and more efficiently than fast food workers. The list goes on. Our environmental and economic systems are being destabilized by the forces of unchecked greed, and the average person will be left out to dry.
The complete failure of the common United States citizen to obtain an understanding of how robotics will impact jobs in the country is the greatest concern. By relying on self-serving union representation, slavishly following the directives of those who are only out to pick their pockets, there is a gap in education and skill that would allow US workers to easily stay ahead of what is needed to compete in the modern industrial environment. Only when the workers themselves go out and educate themselves about this issue will we see real progress as workers stay relevant to the jobs that they need to qualify for.
I definitely think that we should be concerned about United States jobs becoming obsolete due to robotics. I think that as science advances, robotics will be an important factor in a lot of workplace and industries. I think that some American jobs will become obsolete because robots will be cheaper.
Look at it like this, if every company in the world let off all of its workers and replaced them with sentient robots, then no person would make any money therefor no one would be able to buy product from the companies or manufacturers, robots will never fully replace humans due to money, because you can't pay a machine to make your product for other machines to buy it, it just doesn't work like that.
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If someone was going to be concerned about job loss to robotics they should have said something 20 years ago. This isn't a new problem or fact of life, it's something that has been going on for a long time. I think we're past the point that we should be concerned. The jobs are gone, the technology is in place.