I am certainly no expert at tanks, or their armor e.g. Chopham or Sandwich-honeycomb armor or whatever is supposedly better. I can identify most of them and that's about it.
Having said that, 3 criteria come to my mind.
Human lives
$ And cents
Future technology in 15 years – which we "normal people" can't even think of or envision presently.
Human lives:
Especially the Western democratic world can't cope with human lives lost on the battlefield, and is even more reluctant to shed these for the sake of freedom for others.
A destroyed tank usually takes 4-5 human lives with it. As such an anti-tank weapon must ensure at minimum that no more than 1 live gets lost by its respective operator
which then would more or less already exclude using an own tank for that purpose.
$ and cents:
the presently most modern western tanks are holding a price tag of $ 20 Million+One can imagine how much the next generation and the following is going to cost in 15 years. Countries presently such as China, Russia and e.g. India, their top tanks are costing $4-5 Million. Maybe the kill ratio of a western tank is 5:1 but I wouldn't bet on that in 5 years
and more, to remain in that ratio.
Future technology:
e.g. drones in all kind of versions, to me it is amazing how drones have evolved in the past 15 years. I am not referring to the kind of MK-9 Reaper or Avenger by General Atomics
which are already having the same price tag as a modern MBT. No I am looking at the $500 kind that e.g. China is selling to the private and military market.
Is anyone familiar or remembers the 80's Bundeswehr Luftwaffe system – MW-1 Luftverlegesysteme (aerial mine dispenser system). Or similar the British system JP233 LAAAS
(Low-Altitude Airfield Attack System)? See photo of the MV-1 system.
Now just envision these mines replaced by independently operating mini attack drones, armed with explosive or respective tank, vehicle, infantry or building destruction devices.
And that kind of system could be deployed from any kind of launching device right down to a manpad system – not just restricted to an aircraft.
This is what the military future in 15 years would look like to me. And I don't think that one would then like to drive around in something big.
In the meantime keep upgrading the best modern tanks we presently have, with self-defense systems, ammunition and targeting technology we keep on developing anyway.
Regards
Jagdflieger