Modern V/8's

They may put the peak where they want, but the actual amount of torque at said peak will still be proportionate to displacement.

True, but also proportional to boost which can be significant. That's more my point, when boost from a turbo comes into play with good sophisticated controls and plumbing the torque and HP characteristics can be modified a lot more than on a NA engine. Without a turbocharger you're pretty much limited to modifying hard parts like camshafts, cylinder heads and manifolds if you want to alter the output and that can be very expensive and labor-intensive on more modern engines especially how they're packaged into modern cars.

I'm excited for this new turbo I-6 but having it completely replace a V8 takes away some of the excitement. I am hoping at least to see them finally have a RWD performance car (with an IC engine) that weighs less than 2 tons.