AAA guns have been losing relevancy for decades as high and fast flying planes can bomb targets with great precision. But now with drones playing a ever more important role in warfare AAA guns are regaining their relevance.
Traditional AAA guns are not optimised against small commercial and dedicated tactical suicide drones like Lancet since 20-30mm is just too much firepower for such tiny targets.
Traditional AAA are useful against Gerin type strategic suicide drones, but I think such drones are a one-time deal as they are too easy to counter if countries devoted any amount of resources against them that they will rapidly loose their effectiveness and especially cost-efficiency.
Traditional big cal AAA will likely continue to remain sidelined and heading to extinction, but we will probably see a proliferation of 20-30mm mobile CIWS style AAA gun platforms as both tactical and strategic close defence for assets against cheap saturation attacks.
If they deploy enough of these mobile CIWS AAA with sufficient quality, it might even upset the current dominance of artillery if they can effectively intercept incoming enemy artillery and maybe even ATGM rounds to shield armoured spearhead assaults. If gun based mobile CIWS AAA can do that, then we might see the rapid evolution of a whole new branch of land vehicles that reply on speed and active defences instead of armour for survival. If heavy armour is no longer a core requirement, then we might see a rejuvenation of the cushioned hovercraft.
Imagine a massed assault of armoured hovercraft effortlessly gliding over enemy minefields and using 30mm Gatling cannons to shoot down incoming artillery and ATGMs and 7.62 Gatlings and automatic shotguns to take down Lancet-class suicide drones and DJIs. Then once they are close, all those 30mm gatlings get pointed ground-wards for direct fire suppression as troops disembark from the hovercrafts.