I have a very interesting theory. I believe that the Quagmires will return in end of the tenth book and the Baudelaries will spend the eventh book with them untill a basket containing the Baudelaries breaks from the self sustaining home. Then in the twelth they convince someone that they are not really murderers and he will let them hide out in her gameroom (thus The Grim Gameroom), but they are captured and the next book takes place in a jail before they escape and end up on the lamb. The survivor sees them on TV and saves them but Olaf ends up getting their fortune anyway.
Wait... Have you read all the books? If I'm hearing you correctly, (You need some punctuation) you're saying that the "V" in VFD stands for visual or vision, right? Well, it actually stands for Volunteer. (It's in the 7th book.)