Yes but in the context of the natural cycle. Like Mufasa telling Simba about the circle of life. A Druid using disease magic would be very weird. Insect Swarm was about as close as you might get to what I think you’re getting at, as in, you could maybe think of them as carrion flies or something. But nothing in the lore makes that the case for sure. To me, it was just a Druid commanding nature to come to their aid. And regardless, they moved away from that spell to many people’s dismay and pushed Balance spec into a more astral theme. It’s been this way for a very long time now, and I do not see them pivoting and completely reworking the theme at this point.
Like I said, a new class would be more suited to something of this nature.