I was a bit doubtful of Mr. Hudd's figures in post #12 so ran them myself*. I came up with a lower factored LD of 2300m for a flap full, medium autobrake landing in the stated conditions with a serviceable A321 at MLW. This would imply an overrun was not inevitable. Also, if the reversers are "generally not much use" why does Airbus calculate their use in this situation saves almost 300m?
* Using my airline's tables for this variant.