The change won't happen over night, it will be gradual. Fewer people will pursue truck driving as demand dwindles, instead training for a more in-demand field.
Software development is taught in elementary school now. So I suspect a lot of the next generation will pursue that.
The underlying issue is machine learning is making more and more jobs unemployable. Those jobs would not be economical for humans to do at any price (ie: $0).
And saying that software development is going to be it is simply fallacious. It's obvious to me that most software development is also going to be eaten up by lower levels of machine learning. And also, software dev is very easy to export and 'grow' in the lowest wage countries you can find. And import is easy, unlike any physical good.
And it still leaves the big question: What are we going to do with massive unemployment?
Software development is taught in elementary school now. So I suspect a lot of the next generation will pursue that.