I know that with each tooth extraction the facial height/width shrinks 2-4mm, is this true for wisdoms? Strongly cons. implants.

Implant placement  in Wisdom teeth location is not normally performed the only time we are concerned about bone loss once wisdom teeth are extracted, is when the roots are very close to the the 2nd molar roots. After wisdom tooth extraction, bone defects might develop on 2nd molar. This usually is regenerated using bone grafts. Implants are not needed 

To maintain facial height (or what we call vertical dimension), it is critical that patients keep their premolars and first molars. Second and third molars (wisdoms) are not critical to maintaining vertical dimension. Many occlusal analyses demonstrate that in normal dentitions, biting forced are concentrated on the premolars and first molars. 

Most of us do not have room for the wisdom teeth to come in and if they do, most are not in contact with each other. Thus, there can be no stimulation and there would be no room for implants. Although there will be some bone lost back there when they are removed, that will have no effect on facial height, aging or narrowing. Your premolars and first molars are the ones to be concerned with. If you are doing research, please be sure that your knowledge comes from reputable scientific sources that do appropriate research. Anyone can post anything on the internet and make claims without scientific verification.