Why this worry is reasonable
The concern
The objection, stated properly
A teenager asks what they should study. A school wants subject choices signed off by the end of the month. You have to answer, and the honest answer — that nobody knows what that field looks like by the time they finish training for it — is no use at all to somebody filling in a form. So you answer anyway, with whatever you have, aware the entire time that the ground under the answer is moving.
What makes this a serious objection rather than free-floating anxiety is the second problem underneath it. The people telling you this technology will transform work are, in large part, the people selling it. A company saying its product can do the work of a department is describing a product, and the description is also a sales pitch. That does not make it false. It does mean the forecast cannot be taken at face value, and it means the loudest voices in the room have a direct interest in the answer.
There is a mirror version of the problem on the other side. The reassuring forecasts — that new work always appears, that this is one more wave like the ones before it — come from people with their own reasons to stay calm, and they are usually delivered with the same confidence and the same thin evidence. A parent looking for a straight answer is standing between two groups who are both very sure and who cannot both be right. Noticing that is not cynicism. It is an accurate read of where you are standing.