I was just at Ft. Benning a couple of weeks ago. Tanks aren't going anywhere.
Sadly, our military-industrial complex has managed to convince a bunch of derps for decades that the United States is always just a half a step out in front of everyone else and so that means the US has to spend-spend-spend. In the 80's the DOD used to publish these magnificent full color guides which outlined all of the Soviet Union's weapons systems and compared them to what the U.S. had and they would always over embellish the capabilities of the Soviets in order to keep the defense spending up.
That said, I've seen several videos of Russian hypersonic missiles in action, and we better figure out how to defend that very quickly.