at times when someone uses Second Chance you can actually get a few kills from the.. when they get in Last Stand mode.. hide around them and wait for their teammates to come and help them

kinda like a baiting with care packages.. ghost can be countered with a motion sensor(which you can pick back up and bring with you).. it's a bit slow to put it down.. but does help you get kills through walls..
also using a smoke/flash etc.. you can kill ppl in last stand..
I honestly would hate it if they took ghost out.. makes it alot easier to take out heavy air support.. which most people camp to get..