No, not all wisdom teeth need to come out. If the jaw bone is large enough to accommodate all the wisdom teeth in the mouth in the proper position and if those wisdom teeth are kept clean and cavity-free, there's no need to have them removed.
On the other hand, if the wisdom teeth are completely inside the bone and not causing any discomfort, Dr. Davé may recommend you keep those wisdom teeth and monitor them every few years with the help of X-rays.