Sorry to hear that.. Once the physician and audiologist determine that the hearing loss is non-medical (i.e. blocked ear passages, or conductive hearing loss) - which seems to be the case - then they will most likely look for solutions using technology. Depending on how severe your son's hearing loss is, he may be a candidate for BTE hearing aids (which are the strongest/most powerful hearing aid types available) OR cochlear implants or another audiology implant, like bone inducted. For 90-95% of patients with sensorineural hearing loss the treatment is technology.
That's because the doctor is motivated to make use of the hearing cells your son has left, in order to amplify any existing sound. Hope this helps.