By "DSL", do you mean only a text file bundled with the application? I'd say the simple answer is that the median language got a lot more powerful. We write D

By "DSL", do you mean only a text file bundled with the application? I'd say the simple answer is that the median language got a lot more powerful. We write DSLs in code now, just like Lisp programmers have all along. We just don't tend to call them a "DSL" any more.