One way to measure success is based on Students’ Grades in Later Courses.
I can see some good:
My courses would stack up to others more equitably.
People wouldn’t be able to give wholesale good grades for poor work.
It would be a more reliable source of feedback than student evaluations, written in a semester when they are not happy with their grades.
On the other hand, I can also see some bad:
The proposal is to measure something that the instructor cannot control, not just how well the student learned, but how well they retained and applied what they learned.