Usually in my experience these radical arcs take about a year to die off. The sooner the better in my opinion. Also, why does Dick look no different than Bruce when he's wearing the costume. I would think the artists can do better. At least make Dick look a LITTLE different!
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.