A Better Way to Evaluate Faculty?

This article - behind the Chronicle's paywall - makes a really interesting point about how to measure the quality of instruction. A student's grade in Calculus I doesn't really demonstrate how much they've learned. If I could instead track their grades in subsequent courses - Physics, Calc II and III, Engineering, etc - I could get a better indication of how much they learned in Calc I.

One Measure of a Professor: Students' Grades in Later Courses:

According to one widely circulated grading template, an A should signify that a student is 'unquestionably prepared for subsequent courses in the field.'