As in inveterate queue clearer, the behavioural impact is negligblenegligible. The cognitive impact, however, is unwelcome. The red dot immediately signals dread: "Oh, there are a heap of these things to deal with now..."
Save the red for when you really need it (ie., when the queue really is backed up: 10 or more, or whatever the old threshold was). Bring back the grey so the site feels less like it is on fire all the time.