I don't think there is the slightest chance of enough shift in public perception for any government to even consider such a draconian change to the law.
Not sure what sentence you are talking of, since there wasn't a case specified in the OP, and no sentence.
Ah, my mistake, I was thinking of the sentence in the drunk 4x4 driver thread.
I agree lifetime bans are not on the cards, but things are moving in the right direction, albeit slowly.
I'm old enough to have covered one of the earliest death by dangerous cases around 2000.
Previously, killing someone on the road was pretty much a free hit.
Since then we've had other new offences such as death by careless, causing serious injury by dangerous, and other enhanced offences relating to the condition of the driver.
Twenty odd years is about a generation, which in terms of the law is quite rapid progress.
It's a reasonable expectation that general attitudes will continue to move in what most of would say is the right direction.