This. I expect this to be the near term outcome of a lot of autonomous driving projects, which is one of the reasons that despite my scepticism about the idea we're close to abandoning the steering wheel I still think the research itself is inherently worthwhile when conducted safely.
I need this feature, and I would prefer this to full autonomous driving.
A computer that warns you when you're about to make a mistake is achievable today and will increase safety for everyone.