Seems to me the sensible decision is to retire, as he doesn't need to jeopardize his future health. But if there is a way for him to continue, in another league/country, then I assume he will take up the opportunity. He is still young enough to want to continue playing, but I hope he is given the right medical advice and he makes the right decision for him and his family.
Not a medical professional but to me this sounds like the best advice.
What we all witnessed , was shocking enough and he has been lucky to survive. He seems an articulate man, and with his profile he can contribute a great deal "off" the footy field.
Either way, I wish him the best.