When Dijkstra wrote that, kids did not have access to computers. Any child has the flexibility to learn the, ahem, basics from BASIC and move on after discarding it.
Adults, on the other hand, tend to stick with what they first picked up on. Look at how badly most (non-techy) people use modern GUI-based systems, sticking rigidly to the few things they have picked up over the years.
This thread has lots of people who learned to program BASIC as a kid and then moved on, they think their experience invalidates Dijkstra, it does not, it reinforces it. Dijkstra was spot on, except as a training language for children BASIC is harmful.