I'd keep the 3 QB's ... Injuries happen and as yet I don't have a ton of confidence in our o-line. If you do cut one of them, and I do mean cut, who are you going to keep, a guy to play special teams which the league is trying to kill ?
At best you'll get a day 3 draft pick and that generally becomes a camp fodder player next year ... just keep the 3 of them.