It will only get worse, but not because Berger's departure. Warner's executives are to blame for this. One of them forced DC to offer a shitty contract to new authors. Meanwhile, indie publishers are offering way better conditions. It's no wonder that everyone's bringing their ideas to Image, Oni Press, etc. Unless you are Scott Snyder, Jeff Lemire or someone who wishes to enter DC Comics, Vertigo only offers disadvantages.
It will depend on the new,upcoming series in spring of 2013 and second half of 2013. If there is a few good new series, Vertigo is still doing well. There are several good series now but there needs to be a new growth, a new generation.
Its not only doom and glooms rants but what the people in charge of Vertigo comics has planned and if they can get comics by rated creators. A new Scalped or a new American Vampire can make it feel still strong,fresh imprint.
The Walking Dead,Fatale,Near Death,Storm Dogs,Happy,BPRD,XO-Manowar
American Vampire,Animal Man,Swamp Thing
Daredevil, Winter Soldier,Indestructible Hulk
The upcoming cross-overs, reboots, glitter and 1 per 20 books ordered alternate covers will improve the line drastically. :)