Well, it's not dying off in a year. Not based on response and sales. And the reason Dick's suit doesn't look differet are two fold. One, DC/WB didn't want a total revamp of the suit. They had restrictions that they placed on DC. Second, Dick is honoring Bruce and isn't going to change it took much. Bruce rationalized that the costume he wore shouldn't be drastically different when he made modifications over the years. He wanted it to be seen as one man, in one costume. Dick is following that by not altering the suit to the point that someone notices it isn't him.
Sorry, I meant to imply his face. I know the story line's reason that it is supposed to be one man but when Dick was in his Nightwing suit his face looks like Dick/Nightwing. Maybe he contorts his features in the Batman suit. Anyhow, I personally hope the arc ends as soon as possible. The Batman stories were much better than these.