The United States soon may have too many physicians who specialize but not enough doctors in family practice or general internal medicine, the Council on Graduate Medical Education said Thursday. "There is now or soon will be an aggregate oversupply" of physicians, the 17-member council concluded in a report to the Department of Health and Human Services and to Congress. The extent of the oversupply cannot be measured, nor can predictions be made on how long it would persist "because of the many factors affecting the physician supply and the demand for services," the report said.