Personally, I'd much rather see advancement / acceptance of self-drivers even if limited to highways than incremental improvements to traditional cars.
The main, perhaps only reason I really care about response and acceleration is the generally selfish, adversarial behavior of human drivers.
The contrast between the same daily drive in a 4-cyl compact and torquey V8 is stark. In the former, every lane change has to come with permission - that drivers are often unwilling to give. In the latter, I'm in complete control.
I'd much rather the third possibility - to know we're all on autopilot gliding along at a safe, predictable rate to our destinations.