Also there is a whole science around aerodrome operating minima.
Simply put if you have the required visibility for the type of approach which you are making it is highly probable that you will have the required visual reference at Decision Height.
Many airlines now use the monitored approach system when weather is below certain values. The First Officer flies the approach whilst the Captain looks for visual reference and takes over if/when he/she has the required visual reference and lands the aircraft. If at DH the Captain has not taken over control the FO automatically performs a Go Around (hence the FO is known as "The Go Around Man/Lady". Hence the scenario you pose would never happen.