Yes, but it'll only result in a cheating reference if it's Belichick and the Patriots who do the devious deed.
I can't imagine Peyton would want to subject himself to the grind of being a HC after calling it quits. The guy's worth what, $100M ... he outta ride off into the sunset and relax for the rest of his life. Or, get into some aspect of ownership.
I too thought the booing was tough to watch though, I can understand in some ways as Manning has no real connection to Denver fans other than being a highly paid, hired hand brought in to win them a SB ..... something that Manning didn't deliver. Still, be that as it may, I thought it was dis-respectful for them to boo him off the field as they did