Not sure if you meant to imply it, but you don't need to remove driver liability to incentivize the inebriated to use autonomous mode. That's a calculation even someone who's blackout drunk can easily make.
Removing liability might incentivize more people to, e.g., drive their car to a bar. I'm not sure that's a good thing. Maybe great for bars and restaurants, or possibly quality of life, but removing liability probably has other unintended consequences.
It's maybe too early tell whether criminal liability should be changed, or at least how it should be changed. If criminal liability had been removed when Tesla started making their extravagant self-driving claims, surely you'd agree it would have been too soon, and potentially resulted in more accidents. Few if any consumer autonomous driving modes are as reliable as Waymo
Absent statutory changes, common law tort will probably evolve in some states to take into consideration new incentives and norms, and that might help point the way for changes in criminal law. Those policy changes are typically driven by courts wrestling with real world cases, whereas de novo legislative changes are often driven by imaginations and lobbying.
Criminal liability aside, if I am in a wheelchair all my life, requiring expensive medical care, someone will need to pay for that. So civil liability will need to be sonewhere.
The manufacturer would still be liable, same as if the brakes malfunctioned.
Is that not precisely the point of the current discussion? Currently, the manufacturer is not liable. The liability can not be delegated by the driver.
The manufacturers of a self-driving car can be held and are held liable today, same as if the brakes were defective (strict product liability) or improperly marketed (negligence). That doesn't mean the driver might not also be liable. It all depends on why an accident occurred and a host of other factors. There's really nothing special about self-driving cars in this respect, except that litigation can be much more factually complicated. For failing breaks, it's relatively clear given X speed and Y distance, and assuming they were engaged, whether they worked. Then you work backwards from there. Negligent driving? Poor maintenance (driver or mechanic)? Defective design? But in driver assistance and automation systems there are many more questions about what was actually expected to happen, or what was reasonable to expect to happen.