The new rule as I read it per AWS is that if you currently are a CAWI, you will no longer be allowed to re-certify as a CAWI, but must pass the exam for the CWI level. I interpret this as follows. If you earn only a CAWI the first time around, once your time comes up for re-certification, you have to pass at the CWI level. Nine years should be more than enough time to learn enough to successfully pass part B. This is really what you want anyway, as a CAWI cannot by code work independent of the oversight of a CWI.