[Imp]

I think they & drones have a window of opportunity that is vanishing as radars are being updated to detect them. Currently I think most air defence units would class them as a bird because they are to slow so ignored to reduce clutter.

Bases are probably covered now either by close in air defence or the "Dome Defence" guns designed to intercept things like artillery. So long as the radar is capable its a software update to recognise they are a threat.

So some guns can take them out now have seen talk about updating short range SAM air defence to intercept also, probably the reason the US is bringing them back.
Also read developing an Air to Air missile that is small & relatively cheap, seem to remember the idea is it can carry 4-8 on a pylon & be multirole.

Guns makes the most sense unless its a massive swarm using a missile to destroy them is not exactly cost effective.