So the main argument for the .308 is ammo price and that its almost as good as the 30-06.
I can see buying an M1A because you want one. I don’t think I’ll buy something because its almost as good as something else.
If you want a battle/tactical/target rifle, hard to beat the .308. If you are looking for a big game rifle or a little more versatile rifle, no round is offered in more factory loads of different weights and projectiles than the old .06.