I wonder if we will eventually see the same drop in general knowledge we saw with manual driving (in some parts of the world), cursive handwriting, clothing repair, etc. Of course, coding was never as prevalent as these practices in the general population, so it might be harder to measure, but I feel we will definitely see it taught less in schools, harder to find resources, etc. in the coming decades, becoming more of an underground hobby.
It is guaranteed to happen. The key question is when is it a problem? We've lost lots of knowledge as a society but we're still going. Some skills decline in usefulness, others gain utility with the passage of time. Tale as old as time.