Well the fact is that we could seen throuth the past 22 years incredible advance in vehicles armor protection.
Be it advanced explosive reactive armor like Ukrainian Knife and Dublet, a really unique types of ERA.
Be it advanced composite armors, and what is probably more important, attempts to reduce their weight without reducing their effectiveness, of course this will probably be achieved when nanotechnology will mature as such.
There are of course other ways to increase vehicles survivability. The pioneers in that aspect are Americans who were first (and still up to this day they are) to design a tank with completely isolated ammunition compartments.
These developments can be well used to increase armored vehicles survivability on the battlefield. And there are more ways to do that, from active protection system to new ways of camouflage, from multispectral camouflage nets like Barracuda, Berberys, Nagidka and Kontrast, to multispectral camouflage paints.
Photos above show two tanks, one covered with standard camouflage paint, and second with Intermat multispectral camouflage paint that makes it allmost invisible for thermal sights. Simple, reliable, cheap way to camouflage vehicles.
Today air assets rely mostly on thermal sights to detect enemy, but we should remember that thermal sights have limited detection range, and limited identification range that is smaller than detection range.
This means even bigger problems for ATGM's, aircrafts, attack helicopters to efficently attack ground vehicles.
But there is something else.
We should remember that tanks are part of bigger system, so let's imagine that tanks and not only tanks have not only advanced composite armors and ERA, not only active protection systems, but also such camouflage assets, and also air defense.
Such combined ground forces are power that need to be respected, as highly survivable vehicles with firepower and mobility can be very dangerous, both in conventional as well assymetrhic conflicts.
And as to that, technology still goes ahead. In fact ground vehicles allway will be cheaper than for example aircrafts, not only in purchase costs, but also service life costs. It is not visible yet, but for example engines, at least Americans are openly working on very fuel efficent, quiet hybrid engines for wheeled and tracked vehicles. Other mechanical components of tracked vehicles like tanks become more and more durable.
If someone forgets about these developments only to force his ideas, mostly unrealistic, we can be assure that it will end only as a waste of time and money. Our American friends learned this the hard way with Future Combat Systems program, fortunetly for them some positive technology breakthroughs were gained so this program was not so huge waste of money afterall.
Oh and one more thing.
Of course reduction in weight is desirable, but the question is, if we know where is a upper limit of vehicle weight, where is a lower limit of it's weight?
It is really good to have a 20 tons tank? Protection level can be same as in 75 tons heavy vehicle, it is not important, but the question is if such light vehicle can for example handle mine or IED explosion?
I think that the answer is modular scalable armor package.
Ok so now what I mean by this?
Let's say that the weight of our future MBT without armor will be 40 tons, or better 30 tons.
The vehicle design is with crew in hull, and with unmanned armor.
Now the armor protection. It should be based on advanced composite armor made with use of nanotechnology to reduce it's weight but without sacrificing protection.
In my opinion there should be 4 armor levels.
Level 1 (Light) - Armor package designed for assymetrhic conflicts, low density, optimized against shaped charge and EFP threats. Weight increase to 40-45 tons.
Level 2 (Basic) - Armor package designed for assymetrhic and conventional conflicts, front armor optimized against most popular threats, side armor package optimized for shaped charge threats, weight increase to 45-50 tons.
Level 3 (Basic-Heavy) - Armor package designed for full scale conventional warfare, front and side armor enhanced against more dangerous threats, possible use of advanced universal heavy ERA, weight increase 50-55 tons.
Level 4 (Heavy) - Armor package designed for full scale conventional warfare, front and side armor enhanced against most dangerous threats, possible use of advanced universal heavy ERA, weight increase 55-60 tons.
With known advance in armor materials such vehicle configuration is possible. Unmanned turret do not need heavy armor, so 80-90% or more of protection can be concentrated over hull.
Weight reductions can be also obtained by use of more compact engine, and for example hydrogras suspension system.
Hydrogas suspension system have also other advantage, it can also have option for variable controlled height, so installation of additional counter mine/IED belly armor is easier and hull can be placed then much higher increasing belly protection against blasts.
For further protection we can add active protection systems and camouflage assets mentioned above.
Ah and one more thing, such configuration is rather only possible with unmanned turret design.
But can be applied in to variety of vehicles, be it also IFV's, APC's, SPAAG's, SPH's, ARV's, ABV's, so not only MBT can benefit from such design solutions.
My idea is based on:
US Army ASM (Armored Systems Modernization) program and Russians "Armata", "Kurganets" and "Boomerang" unified combat platforms programs.