Reading THAT little gem in the book gave me the creeps, lol. Since conjuring a Patronus is such a difficult thing to do, I wonder how the wizarding world would deal with a bunch of baby dementors...ugh. One would hope they wouldn't be as strong as a "regular" dementor. Like you, I'm pretty sure that will come into play in Book Seven. More recruits for Voldy. *sigh*
"shudder"
The picture of that is not too pleasant!