Bradley may be replaced, and probably even quickly, but the Leopards .. they will also be replaced, but instead of 2A6 it will be the ancient 1A5, after they are restored to a sane state. So, Ukraine should not rely too much on Western tanks, especially since Kiev has already become disillusioned with them, they say the old Soviet ones are better, easier to operate and live longer on the battlefield.
Riiiiiight. So how come Putin's glorious armed forces using the best-in-the-world soviet military equipment couldn't defeat Ukrainian forces that had very little Western equipment at the beginning, and still can't defeat Ukrainians with more Western equipment (albeit inferior if we were to believe your story). Something not adding up.