Its about the team lads, Given would come in because we need every defensive boost we can get, he knows the game, he knows the league, he's experienced, and he's better than Hart.
We all love Hart to bits but he's only 20 or 21 or something, and he's not stupid enough to not realise we would be looking for a new keeper because we simply dont have the experience in that area. If anything its a good way for him to get rid of bad habbits and learn a lot from a very good international regular keeper.
He'd get a lot of game time next season with new cup prospects and the odd league match if Given is injured. Hart isnt going to find many takers in the league willing to give him guaranteed first team football, and clubs that will won't be challenging for anything anytime soon, all the top 4 and Villa have good keepers and plenty of backup, especially the rags.
Theres no coin toss here, Given has CL, UEFA cup and World cup experience, we'll get a good few seasons out of him before he moves on again and Hart will be older and wiser because of it if he sticks with us. Five years down the line I'd love to see Hart our undisputed number one.