As to the rest of their function, I think probably the biggest obstacle will be the ability to safely manipulate the human body, as in turning or moving the patient. That requires delicacy, advanced tactile sensors, and physical power. For fine detail work, such as finding a vein with a needle, the technology already exists. Elon Musk also predicts that robotic surgery will rapidly outpace human surgeons, and I agree there.
On the subject of human teachers, my comment is similar to that about human nurses. A human connection helps with motivation. That said, I think video serves much the same function, and with video one teacher can reach an unlimited number of classrooms. That’s independent of how humanistic the teaching robots will become, and I expect that will also improve rapidly. We are nearing singularity like situations with engineering problems, in other words recursive improvement without much if any human intervention.
Seems like a decent reason not to believe it, frankly
What looks like exponential curves turn into S-shaped curves everywhere. In the last century, coal power plants have gotten less than twice as efficient. A professor at law school was giving a lecture on technological singularity back in 2011. And I pointed out that Moore’s law was already dead. And in fact in the decade since then improvements came far slower than they did from 1990-2000.
It’s better now by roughly a factor of two per passenger mile.
The nature of such large improvements is that it’s extremely hard to get such an improvement again!
Which is just not that big of a deal for 50+ years of technological development. It doesn't allow you to do anything you couldn't do before.
It allows you to move freight really fast at half the cost. That's a lot of things that can move around the world 100X faster than they could on the next-fastest available mode: ships and trains.
That's leaving out fuel prices. The planes may use half the fuel, but aviation fuel has increased 7x in price since 1990. I couldn't find prices for 1969, but if you take the price of crude since then you're looking at a CPI-adjusted increase close to 100x.
Of course, inflation should be canceled out before evaluating the overall benefit. If you can self the goods for 7X then the fuel savings is back to 2X.
Made me think of this 90-year old demo:
Yeah, but "we" (note the scare-quotes) can always just decide skimp on those "core aspects of teaching," which may even be a tempting option when "we" decide "we" have less need for educated workers.
I think you are greatly underestimating the difficulty of automating nursing tasks.
About teachers: some amount teaching profession can be automated, but the parts that cannot (in any reasonable way in the foreseeable future) are perhaps the most core aspects of teaching.