However, (it's highly theoretical), but if the RVR below 1000ft increases to acceptable CAT 3A limits.....
I haven’t found chapter and verse for RVRs improving after 1000 feet AAL but certainly as far as I am aware and certainly I have always been taught that (for better or worse) you are “locked in” to the RVRs last received by the Approach ban point and the consequences thereof...