I was 13 when DTSS was introduced, so never had an opportunity to learn programming with Basic. Fortunately, that didn't harm me, and I've managed to compensate for this disadvantage.
I don't want in any way to minimize the impact of a language designed for non-experts. But, while Basic, and its many limitations, was the best that could be done with the relatively limited systems it was first implemented on, it doesn't scale. I recall, around 1970, building an interactive front end for an inventory system, using a commercial company's version of Dartmouth (or GE) Basic. It came to about 900 lines, and even I couldn't make sense of it.
It's a mistake to believe that non-experts write 20-line mortgage programs, or 50-line dice games. If what you're teaching them has any value, they will naturally want to write programs that grow organically as they understand the problem better. Dartmouth Basic is a language in amber, best understood as what could be done given the equipment of the 1960s, and the understanding of programming development at the time. It was neither better nor worse than other interactive languages of the time, for example, JOSS (which begat PIL, DEC's FOCAL, and even the horrific MUMPS, closer to our time).
I think that the true value of Kemeny and Kurtz's contribution was encouraging programming as a thing for “ordinary” people, rather than a priesthood. The language they invented was developed prior to clear understandings of structured, object-oriented, and functional programming, all of which have something to say even to non-experts. (And, yes, Microsoft continued to produce products with “Basic” in their names, but they have little to do with anything that was developed at Dartmouth.)
So, kudos to all the folks who learned their programming with Dartmouth-style Basic. But I think there are a lot of modern tools that not only help non-experts write short programs, but scale well as their knowledge and skill grows. Smalltalk was one system that demonstrated that, but in more recent memory, Python and Racket are also good examples.
By comparison with film, Georges Méliès did some amazing work in 1900, but nobody would confuse that with the work of modern directors.
(I don't want to get into a discussion of What Is The One True Introductory Language; I have my opinions on that, but they are not relevant here. Instead, I am trying to put the very significant contribution of Kemeny and Kurtz—democratizing computing—into what I see as a better perspective.)