I would change that idea a little. BR 1 to 30 get the killcam fully. Its supposed to help them learn how it works. Make sure they know that this killcam will stop at some time. Above BR 30 the killcam only activates fully if the target was spotted. If he wasnt spotted you dont get a killcam at all. If for some reason killcam still has to stay then if an unspotted enemy kills you the camera wont track your killer and the camera will only look in the general vicinity, not directly at the enemy. This increases the need for teamwork and information gathering.