If the lead character is changed... If they don't overcast the stars from other (mostly CSI) dramas. If the plot will be sufficiently twisty. And if the cinematographer maintains the quality it did in the pilot.
...then this show can survive, but as the other comment said, the main character is too, way too aggressive and he causes the audience to lose focus from the "good" story and other "almost there" characters.
The main plot is kinda straightforward at the beginning, there is the Senator, his wife, who gets kidnapped (you can't know for sure she's not involved in the vanishing, especially as the pilot progresses...), there are several loose ends and characters, who you just can't put on the bad or good side so far. After a few bodies here and there, everybody start to see that it won't be a quick retrieval of the senator's wife.
Keep an eye on it, decide for yourself.
