Once your body has destroyed the area of myelin, it is replaced by scar tissue and not by the original material. If the original myelin were replaced, you would not have as many problems as MS causes.
Hyaluronic acid (HA) is a glycosaminoglycan (GAG), which is a substance that attaches to collagen and elastin to form cartilage. It is promoted as the new elixir to remove wrinkles and lubricate knee joints. The university study believes that the myelin is blocked by the GAG which prevents it from rebuilding. However, they provide no information on blocking the GAG. They do state that their study is not a cure.
If the HA prevents the myelin from reforming, then taking it would not bring you relief. The study says that you have to block HA to allow the myelin to reform, but, again, there have been no HA blocking studies done, nor the short and long term effects which might arise. If anything, the study points in a direction worthy of further study, but due to the FDA process, you are still looking 15-20 years down the road due to the trials and studies required beyond the laboratory animals.