This is only likely to be effective to the extent that you have extensive support at home and that grades are highly valued by the student.
> B) yes, happened to me in higher education, fucked an Electrical Engineering work assigment, got a crushing 0, dropped the whole thing, focused on Maths and CS, changed school, and became a programmer. Gave me a kick to never fail an assignment ever again, so not sure what to do if the 0s are so many the kid just doesnt care anymore.
Higher education is a far different game than primary or secondary school.
My students tend to complete their work. If I was in a position where I had a lot of not-turned-in assignments, I'd probably look at giving students 2/3rds credit for those parts of the assignment that they'd shown mastery of in some other way (in class or on tests). It's still at best a D, and most likely an F, but it does not pull down the average nearly so much.
> C) The teacher doesnt need to change how to measure I think,
I don't fully understand your comment, but-- what I'm saying is: grades are not a great motivator for most students. We treat them like they are necessary to get hard work from students, but I think teachers who get strong performances from students mostly get them in other ways.
I feel like if I'm relying upon a student's fear of a bad grade as a motivator, that I've already lost.