There are two aspects to this. The desire to learn and the utility of learning. These are two very different things. Arguably the best programmers I have known have been explorers and hopped around a lot. Their primary skills have been flexibility and curiosity. The point here was their curiosity, not what they were curious about. Curiosity enabled them to attack new problems quickly and find solutions when others co…
Do you feel yourself losing interest, curiosity, "spark"? If so, then maybe worrying is right.
If you're just (hyper?)focused on something else, then, congrats! Our amazing new tools are letting us focus on even more things -- I, for one, am loving it.