IMHO we should not invest much in tanks anymore, upgrade a hundred M60, upgrade 200 Leo 2A4 and produce 150 Altay (not more)
The tank is already for some time not the strong weapon it has been in WW2. Back than there were not that many dangers for a tank, and it was a difficult to stop weapon but see Syria, Karabag, Ukraine - Russia wars were tanks get destroyed by thousands.
Nowadays tank has too many dangers to cope with: IED's, mines, ATGM, attack helicopters, guided artillery munitions, fighter jets with guided munition, drones with guided munition, kamikaze drones.
We cannot entirely say that the tank is totally useless but it lost a lot of her appeal and usefulness, so much that the German engine blockade in the end was maybe a blessing.
I am of opinion that we should not invest in thousands of tanks, keep it at max 500, invest in useful stuff.