People who invite their own replacements aren't helping the party any, but it's not their fault, not entirely, anyway. Leaders lead the party? When has this ever been the case? I've never seen a real leader. The "leader" is just the guy who invited the first member. After that, parties are all about wasting time debating where to go and who to invite. Most parties are inefficient democracies. Why let these leaders "lead"? They have no plans. When you take their invites, they'll ask you where to camp and if we should invite X player. These are your average leaders, and these are the leaders your average players party with. They always want you to do their work for them. People invite their own replacements without asking because asking doesn't make a difference. Sure, if you put together a party of QCDN celebrities, the stuff proposed here makes perfect sense. If your leader leads, then let him. Most don't.
My personal take on the situation is to consider why I'm leaving, and decide from there if finding a replacement is a good idea. I think of it from the perspective of the replacement, as I found myself little more than a D2 invite a few times. If the party sucks I don't get my own invite. Usually, by the time I'm leaving a good party, I'm not the only one to leave. In fact, I usually start the chain reaction of people who also have to go. If the party's bad, I usually follow the first person who has to go. Either way, I don't look for replacements for bad parties or disbanding parties. I do however, look for my own replacements if the leader hasn't lead thus far. The yellow dot just means you had the slightest bit of initiative in getting some exp. Normally, it just means you're an unpopular job. It doesn't denote leadership ability. I give leaders only as much credit as they earn, not a flat respect just for having the dot.