I think that if the comics are of interest to readers, then they’ll sell, and if not, they won’t.
But things have been moving steadily towards a model of increased release frequency in all media for some time now, so this doesn’t surprise me at all.
And if the choice is to publish, say, a BATMAN series weekly, or a bevy of other titles featuring characters less likely to sell as well–I know which is the better bet fiscally. Creatively, it’s a greater question.
DC’s job, just like our job, just like everybody’s job, is to get you to read and follow their books. They think this is a strategy that will work for them–and only time will tell whether it will or not.