I wouldnt consider BFRs infrantry fodder just yet. The guns on the thing will probobly be insta-gib so infrantry need 2 sneak around 2 its back or they just gonna get mowed down. If the driver or guner has audio AMP, a soldier cant get around 2 the back easily. There is 2 effective ways 2 take it down, a cloaker with sensor shield, or a all out zerg and due 2 limited targeting on it atleast 1 will get by and take it down. Then they gotta deal with armor. So during that time the BFR got 10+ kills against that zerg and 1 with the cloaker.
This brings to mind how they will get the shield back up. Lets gossip about thast, shall we?