I don't think theres any point in having a carousel autoloader anymore.
1. Anti-tank munitions are getting more and more accurate every year, the ammo rack being a target lower down in the tank will not yield much of an advantage when it comes to combat.
2. Bustle autoloaders are in fact faster than carousel autoloaders and are not limited in ammunition length.
3. Bustle autoloaders provide an easy way to implement blowout panels, which allow the tank to survive an ammo hit with minimal damage.
4. even if the carousel autoloader is seperated from the crew compartment, a hit would effectively render the vehicle useless as the turret is still blown out, and devastating damage is done to the main chassis. Meanwhile, a bustle autoloader would simply require a replacement of the turret bustle, the entire interior, including sensitive electronics, high-tech imaging/targetting equipment, and the main cannon/breach remain intact.
5. In fact, the issue with the turret bustle autoloader being easier to hit may not be a point anymore as APS systems advance. In the case of top attack / atgms fired from any direction other than the front, APS prevents a hit to any point in the tank.