Nightwing who has been the best selling from the batfamily line is under 30k already and I have a feelings the double shipping will only make it worse with the increase in the price. So, the batfamily line isn't doing well either.
The problem like I said multiple times already goes beyond the characters because there only very few are selling well enough who have either movies or big name writers on them. There was a report from last year that manga are outselling (destroying in their own words) DC and Marvel sales in America which should be alarming enough sign.
DC ideas of trying to reach a biggger readership with new imprints and trying to sell comic in game and walmart shops is already good start, but I have talked to new readers who give up on comics and the reasons were: incomplete stories, confusing histories and inconsistent art (which I have a big problem with myself because comics are visuals and having bad art will definitely make you less likely to bother with them). So, try find a solutions for these problems and people might give comics a chance.