I share the opinion from @Chrisjh0223
If you can get killed by your teammates some people will using that to hamper their team. For example, the barracks died and you are one of the last Hotwires. You go maybe from the Refinery to the Weapons Factory and somebody just drive over you.
But this thing can happen by accident, too. You just driving around a corner with a buggy and suddenly there is a Medonza and you just kill him.
Or you are fighting against another tank and must fall back. You can't look fast enough behind you and you drive over a technician.
That will be just annyoing. I stopped to play Planet Side 2, because I was very annoyed from that.
I think it will make more problems then it fix. But I can understand you, it is a little bit wired.