Well... this change would really suck for 2 of my defender toons that I purposely set up as teamates. I've have a force/energy Defender and and emp/rad defender set up for buffing and healing. Infact my F/E def, I don't even use his attack form because it cost too much end to keep up with the force fields for the team. So if said changes go into place i would have to delete him. He does no damage (i could blast a bit, but his job is to defend the team). so he would get no xp as i understand it. Also the timer is a good concept but needs to be lengthen. There is alot of honest players out there that are just waiting for the defender to raise. Also some fights last longer because of the fleeing of Mob in which can result in another group aggro'in on in which the dead have to sit and wait.
Just my two cents...