There is a fundamential principle of programming that I think most failed programmers can't wrap their head around at that is GIGO. When you start typing words, most people will have trouble with the rigorous and literal interpretation of words that are normally far more expressive and nebuluous when shared with people instead of computers. And, if I may step way out on a limb, this is especially difficult for women and seems to be a major tripping point for women who are otherwise more than bright enough to be good programmers. I think that Isla seems to be usable for any minimally literate kids (like 6 years old) and can impart GIGO while being really simple and fun. It's not a replacement for BASIC, but it can be seen as a stepping stone to it.