So the only real challenger for a counterattack for a beachhead being established is another tank.
For a counterattack. As in after the beachhead is established. As in the Army is already being unloaded. With their tanks.
For establishing the beachhead, you want just sheer firepower. Until we miniaturize to 60 ton main battle tanks, they're not worth the space for the initial amphibious assault, and that is all the Marines do. Maybe a dedicated light tank design, as a self-propelled mortar, but definitely not a main battle tank.
And if we're talking a serious offensive where missiles don't work, then this technology will be countered by just resuming the antitank rifle modified as needed to have infantry be throwing the same shells tanks go at each other with.
If that tech comes about, then there's also not much in the way of downsizing the actual warhead of an 8" shell to proven anti-tank functions, and use all the extra space to turn it into a guided and armored projectile to just brute-force past economical active defenses.
The biggest thing behind me dismissing those anti-missile guns is that we can just make a bigger missile they can't break. That fragmenting cluster swarm is a lot of space to bolt on slabs of metal to keep it from being pierced, letting you use just one airgapped guidance system instead of a giant pile of them and save on warhead and electronic costs. Or at least soak fire before fragmenting to buy valuable time. Or just get the anti-tank warhead on target with a breachless rifle, possibly partly rail-accelerated to reach the needed velocity.
The calculus of a projectile is based on the target. If your target is a main battle tank tricked out to the gills, then your price range is millions per unit. How much armor do you think we could throw on a TOW with a doubled per unit price? Five times the price? Twenty? How much can those little impactors deal with, and how does the system scale that? They're a system designed for paper-thin aerodynamic skins, because there's never been a need to armor your missiles before, so no gram is wasted on that. Not hard to double or triple the cost of a missile to give it protection from infantry-level fire like those systems use.
At the very least, you ought to be making that fancy splitting missile a half-dumb drone with targets marked before launch by a hardwire terminal and fully airgapped when actually in use, so there's a use case where the big fancy launch platform is reusable. Micro-bombers, not cluster missiles. Also, the entire point of an automated drone is that you can
shut off the recievers from accepting orders until conditions covered by normal operational security are handled, and a failure
there means no amount of cyber security will work because they literally have all the procedures to plug in proper orders, no need for hacking... Except for the possibility of mountains of failsafes to hack through to get it to fire on the ideally-visually identified allies, and pointedly
not using a wireless IFF in the system to avoid
that hack.
Tight-beams that require the signal come from an allied position also greatly complicate hacking, because you have to be between the drone and the base to intercept the signal and then have to send the false signal from the same
physical direction as the base, and as a bonus they are much more friendly to being amplified to just
brute force through EM interference and sheer distance. You don't know cyber security, because Rule One is
don't run wireless and Rule Two is
passwords for everything. Specifically because that is basically required for the battlefield hacking you think will get rid of drones. Punch in the numbers on the launcher, it loads into the missile, missile has no signals received while in flight, ideally not even GPS.
Same procedure works for drones of the automated variety, and if their task is just "fly this path and launch missiles at these points", then a cruise missile based drone can throw out mini-missiles from literally opposite directions to add
tracking delays to those precious defenses you're hawking about. Same-direction volume of fire to out-dakka a
machine gun is the absolute
worst way to deal with the problem. Simultaneous multi-direction bombardment, armored projectiles, baffling equipment, the same system but made to shoot the defensive gun on the other tank, lot of shit we could dump into for bypassing with the cost of having enough warheads downrange to just overwhelm the defense. And if it takes naval artillery to have the space by using fully external propulsion, that'll be procured again.
There's a fuck of a lot of ways to try to kill a tank we don't use, because the missiles are currently better. They stop being the best, we start looking at all the stuff we've shelved for not being as good in current conditions and look into making a replacement from them. Pretty damn big log of backups to test, there. If we need to switch to a recoilless rifle to replace the TOW, we'll do it without question. Incindary or explosive granular impactor, perhaps, applying enormous force transfer to very likely get at least partial penetration, then have it ignite to armor-melting temperature or explode
inside the spaced and composite armor to completely ruin a massive section of the passive defenses, if not end up fully penetrating and then igniting or detoning inside the vehicle to have a highly likely crew kill or machinery destruction.