If a person has bilary atreasia will they possibly need a liver transplant?

Perhaps: Biliary atrecia , non formation of extra hepatic bile ducts, in type i &ii common&c hepatic duct are intact , type iii right and left hepatic ducts are involved , most of the time kasai's procedure is enough ( portoenterostomy) & not liver transplantat in a different condtion intrahepatic biliary hypoplasia, where intrahepatic biliary ducts are not formed, will need.

Yes: Liver transplantation is the definitive treatment for biliary atresia for selected patients, mostly in their childhood. Fortunately in experienced hands the results from liver transplantation are excellent and most children can go on to have relatively normal & healthy lives after their liver transplants.