I think Crayton and Hurd will fill in nicely. I am willing to bet that Glenn retires after this. He may wait until the surgery and recovery is over.
I really like what Hurd brings to the offense, but he’s a solid #3 receiver, not a #2. His skills are not comparable to Glenn’s. IE, he’s not a deep threat/doesn’t demand a double team.
But you’re right about retirement for Glenn, I’m afraid.