> The primary way to engage a small drone (sUAS) is with a missile

That's just not true. Rheinmetal has their Skynex, everyone and their dog does lasers, and jamming is basically free. Phalanx (and its land equivalent) is also a thing, updating their targeting doesn't seem insurmountable.

I'm not aware of any "hot zones" lately where a war was even close to being decided by drones, much less everyone being forced underground. Even in Ukraine with absolutely hapless Russian army drone ops are mostly harassment. For an advanced army drones just aren't that big of a deal really, there are plenty of detection, disablement, and destruction modalities available.