While, the days of massive tank armies are probably passe. US fielded 50,000 in WWII. Tanks combined with an infantry screen, fighting vehicles, self propelled artillery, and air support will be around for quite a while.
US should consider M60 A3 tanks, as well. The last tank before the Abrams. It was designed to go one on one with most of the tanks Russia is using. Several nations still use it. US has some in moth balls and many more that Anniston Army Depot could quickly refurbish. Easier to train for than the Abrams.
Problem is, it’s no longer bone. Fossiled to rock.