What would tank design or even replacements look like in the far future. The proposed tech level is something akin to the expanse, but for hand wavy reasons ships in orbit cannot just bombard enemy positions from orbit or drop fighters/jets into orbit behind enemy lines. Thus a ground war of sorts will exists w/ two sides vying for control over a planet or a moon or a rock etc. What would the next evolution of tanks or even there replacements look like in a situation like this. Taking this a step further and assuming that there are multiple planets in a solar system like earth that can sustain human life perfectly (some contain lots of jungles, others are more uniform in environment types, others are more flat like deserts/plains etc, but all are more than capable of sustaining human without much terraforming needed). How would a faction develop a replacement for tanks that could work on multiple terrain and celestial bodies. At present current tank design doctrine is based around earth and the assumption that tanks will be deployed in areas where they are best suited/against countries where they are best suited (cold war tank design for example played into this). Ideally the replacement should be a basic pattern that is modular, such that the use of specific vehicles for every different type of environment becomes unfeasible.
Edit: I should have been more clear about this, but by something on the tech level of the expanse, I mean that humanity has the capability to traverse the solar system and colonize it. The technology of the expanse can be best described as near future, as there are no FTL/warp drives. Almost everything is mechanical in nature, space travel exists, but its still very dangerous and an absolute pain. Things still require fuel, there is no anti gravity, the only way to get 1g in your ship is to move at 1g, else you will be weightless or pulling hard Gs. Sending and receiving messages takes a time delay, there are no mega laser cannons like in star wars or stargate. Rather the weapons are still very much kinetic based with the likes of rail guns and torpedo's. Though in my setting early weaponized laser systems are being developed for anti ship combat but they are filling in a niche roll that's not been completely developed yet. The existence of multiple planets w/ earth like conditions generates a lot of interest in space travel early on so there wasnt a need to develop heavily armed and armoured space warships because the first concern was getting large ships to carry humans out there in the first place, and have smaller ships with maybe a single gun on it for patrol against piracy or hijacks. This means that the ships are rather weak in there armor, its not like they can tank a lot of damage: mines, small space based rail gun platforms, boxes of just torpedo's/ sentries free floating in space, or even ground to space/orbit weaponry like heavy railguns or missiles would do significant damage to a ship trying to sustain orbit around a planet or attempt to bombard from space. Essentially ships are like glass cannons at the start of the conflict. As for drones and planes, they would still be able to fly, its just that they can be affected by existing countermeasures or just plain shot down, deploying them from an air base is just safer. Its just that for a ship to carry a bunch of drones or planes to position above an enemy in orbit then deploy those drones is very risky as it has a high risk of being shot down (this problem extends to transports and replacements for both parts and soldiers which is a major part of the story). Essentially once a planet has a pretty good ground to space defense setup, approaching it for both sides is a suicide run for a good part of the war.