I've been on a few flights where announcements were made about a passenger in the back with a tight connection, and if people could please remain seated until that person passes that would be greatly appreciated. Most of the time people have remained seated until that person does pass...I must admit I think the one guy's USMC sweatshirt helped matters.
It really is sad that people can't wait for 5 minutes for something like this after being asked repeatedly to do so. But nothing else unfortunately that DL could do...seems like 4 announcements should have been plenty