History has always shown that for every new offensive weapon someone will one-up it with a defensive one or find some way to render it useless; then the cycle continues. Also for every technology you think you control, someone will find a way to take it from you.
If you take WWI for example which is considered the largest technology warfare shift in mankind, the technology cycle of counter measure held true but came at terrible cost. Our 're-balancing' could come at the cost of billions of lives. Think about that.
Also if you like at history, you'd know typically the few control the many and use a gained advantage to be fairly brutal to anyone else.
I'm not so confident this will work well out if people simply let the natural evolution of events happen without putting in altruistic controls and agreements within and between nations.
I don't think that's been true for several decades. Missiles and torpedoes have completely trumped armor in naval warfare. Even today, anti-submarine warfare systems are nearly useless against the offensive capabilities of submarines.
Similarly for tank armor - modern tanks' armor are only effective against weapons that aren't otherwise designed for the purpose of penetrating them. Anti-tank weapons easily destroy tanks today.
