As dumb as it sounds Id keep Tebow around just so he can learn behind someone who well knows how to throw a football and run a offense a million times better then Tim will ever be able to do. So that way after Manning retires he can just take over. But if they did trade him just send him back to Florida..I mean really put him with the Dolphins so that way at least people will come to the games..It may only be to watch Tim do his high school football magic but at least they will get some money coming in.
You wouldn't want to risk the "Tebow faithful", who don't care about the Broncos or Manning, to start petitioning against Peyton though. That's the problem with keeping Tebow as a backup, he has such a huge following it will always cause a controversy. Better to trade him, maybe try to get Gabbert, and see if you can have him learn the ropes from Manning.