> I don't mean we need one, just that tech is no longer fun

Or maybe the whole thing goes in cycles. For example: the 1980's were a fairly significant time for computer themed books for kids (teaching us how to program from a variety of angles). I don't remember that much kid oriented stuff in the 1990's, but then there was the panic of kids not knowing how to program in the early 2000's, which may have been where those shows came from.

Another factor is that a lot of kid's programming is recycled from generation to generation (either outright rebroadcast or developing new programming under the same franchise). That's really hard to do with tech oriented stuff. Even futuristic gadgets would appear to be dated.