Flakpanzer
Oh they absolutely do have a niche role. Becoming the standard? We can both agree that it won't. The barrier penetration is really what's valuable, more than the range.
"Drone Swarms" are a marketing slogan that means everything and nothing at the same time. Overwhelming your enemies defenses by numbers is a tactic as old as war itself.
"Kamikaze Drones" and "Loitering Munitions" are largely just re-branding of the term "Cruise Missile". What has happened is that SPAAGs and other gun-based AA systems have gone out of fashion as missiles and airplanes got faster and/or flew higher. These AA missiles themselves are expensive, but that's fine because the aircraft and big cruise missiles are even more expensive. After decades of this trend, combined with advancements in electronics, it was realized that a critical gap now existed in air defenses at the low end. Forget a cruise missile traveling at 500 mph that costs a few million, build 50-100 flying lawnmowers that do 100 mph for the same cost as that big missile, but carry even more total weight of explosives. Doing this in the 1950s would have been kinda stupid, even if the tech did exist, as gun-based AA was as common as dirt and barrage balloons were still a fresh concept. Such drones would have been far less effective then. Now though? The Gepard Flakpanzer and ZSU-23-4 Shilka, BOTH 1960s DESIGNS, are now the cutting edge in dealing with this threat. Weapons systems that were considered either obsolete or an afterthought are once again critically important. Missiles are simply too expensive to use against these weapons. We will likely see smaller systems, maybe using 30 or 50 caliber guns that are cheaper and easier to deploy. There will be danger since these projectiles won't have a self-destruct, so 20mm might be the smallest.
In addition to gun-based systems, there are also microwave based options that will simply fry the drones electronics. Big cruise missiles are made of metal and fly too fast for this method to be really useful. The lawnmowers are slow enough and largely made of plastic/fiberglass that it can work. Doesn't require exact targeting like a laser does, effective against multiple targets, and also doesn't have meaningful collateral damage risk.
The Russians are actually much better positioned to counter this new threat, as their doctrine assumes that they will not have air superiority/supremacy. Thus they never retired their gun-based AA systems. (Gun based systems are shorter range, but much quicker reaction time than missile systems.) Their systems will need modernization to counter these smaller and harder to detect threats, but that is easier to do than building a new system from scratch. Yes the US has the C-RAM, I'm not sure it can be fielded in the numbers needed though.
It will be interesting to see how this all develops.