I don't see that happening in clan wars since players are so competitive all they'd want is to kill as fast as possible and win clan war points.
And also because everything is possible in gunz, situations can easily change from being at an advantage to being in a disadvantage.
Everything happens so fast I doubt they would just let their enemies med.
In tdm everyone just wants to get the kill in that case you can't expect a whole team to let 1 player med, they will all just chase the enemy down.
What you're saying sounds a little like swapping to me which can happen with kills too so there's that downside with the current way it is now as well.