1.11 automatically resetting death trap

This is my death trap design for 1.11. In the newest snapshots of minecraft, a new gamerule was added called entity cramming, making it that when there are over 25 entities in one area, any more will start killing the entities. But, minecarts don't get affected by this, making them the perfect entity for a player trap. So, I wanted to create a trap that would not have to be reset after every activation. So, I came up with this design that can be placed underground, with a hole for players to fall into.