Heresy! Thine lies find no purchase heathen. The lord and savior Stan of Lee is immortal and shall bringeth his faithful to comic nay cinematic salvation!!!
Didn't he film like 30 post-credit scenes for future movies already? He is still gonna be making cameos even after he dies... and with Disney involved I'm sure they have the technology to just make an entire CGI Stan Lee and stick him wherever the hell they want. He may die, but he will still show up.... dude achieved it: immortality.
I have some very sad news