Not sure how relevant MBT's will be in the future of warfare, not without some huge changes. Obviously drones are now a major threat to them as shown in the Ukraine conflict.
Keeping the hatches closed would reduce that threat quite a bit. With ammo stored in the floor of the Soviet style turret, a grenade dropped in can have devastating effects on the platform as well as the crew (it isn't good news for the crew, in any case).
But with the vertical deployment of RPG warheads designed to penetrate armor, and the tendency for the armor on top of the turret to generally be less robust than side or frontal armor, designers might have to rethink armoring the upper surfaces, something which will add weight to the platform. Slat armor (deployed as a defensive device against RPGs on Strykers) may help, but then the tank starts resembling a Lobster trap, and adroit drone operators have already proven themselves up to the challenge of getting through that.
We have reached the end of one era in warfare and are seeing the dawn of another, especially with the deployment of drones in the Ukraine/Russia conflict in both aerial and maritime contexts.
The tank, and perhaps the capital ship may yet become dinosaurs in future battles.
