Professor Evaluations. Good as is?

So, in the previous post I put up pages out of the faculty handbook that describes how professors are evaluated. The evaluation process is incredible rigorous and makes sure that teachers have an established teaching philosophy and classroom method that work. But after those six years, professors evaluate themselves and send it in to administration. Other than that, it is up to student to do professor evaluations to show Academic Affairs which teachers need to change their style.

This ins't a horrible system. But if teachers have been going unevaluated for twenty or more years, shouldn't they be evaluated? Students don't take their duty to Academic Affairs seriously. I think teachers should be evaluated every five years at least after the six-year tenure review. That is just my opinion. Is there any better idea of how to run professor evaluations? It would be great to give feed back to Academic Affairs. Policy could change along with the vice-president of Academic Affairs at the beginning of next year.