My assumption - and I'm sure it's a good one that most people would agree with - is that this mechanism was designed to deter in-progress hunting. Since you cannot join in-progress with a party, I see no reason why they couldn't keep the system as is to serve its purpose while removing it from pre-made party queues. This leaves only the vanishingly small number of people withdrawing as a party to troll individuals, but I suspect the number of occurrences of such an activity is negligible.