A Missed Opportunity
The folks at the film studio must be regretting not pursuing this idea. Just imagine the impact if they had cast Stan Lee as an elderly Captain America. Each of his cameo appearances would have served a significant purpose!
Every time you saw him in a Marvel film, it would be because he was checking in on his old friends. It would have been the perfect tribute to the late comic book creator. Thank you, Mr. Stan Lee, for all you've given to the world. You are and will always be deeply missed.