My guess is that this is one of those situations that they rework the whole thing. Here is a list of things they would have to do.
1. Somehow make it impossible to travel across the chasm without the bridge. *Maybe they make the chasm larger
2. place an invisible ceiling so guardians cannot climb the tower
3. Make it so that a minimum of 4-6 players need to be alive and on the other side of the chasm. *for people that will send one over to solo it or have multiple self-rez warlocks
Am I missing anything? unless they do all three of those things, this portion of the raid will still be cheesy.