Already been renewed
I didn't like the pilot much, but it's grown on me since. Damian Lewis is awesome.
Doesn't hurt that Sarah Shahi and Brooke Langton are very easy on the eyes either. That despite Langton being old enough to be my mother, albeit a very young mother (I'm 21, she's 37).
While it would end the purpose of the search there are still ways for the show to go on. For one thing it might turn out that the Bank shooting and the murder setup are separate, or at least more separate than we think, leaving one of them for next season.
Even with those plotlines resolved there's still plenty to do. They're cops, there'll always be crimes to solve and I'm sure they could come up with new season-long arcs. Hell, even a procedural with Charlie Crews would be worth watching.
One final thing, the description of Dirty Sexy Money as the "filthiest show on TV"... that surely can't come from someone who's actually watched the show? Has to be from some promo monkeys who have only seen the title? It's not filthy, it's simply an entertaining show with a good mix of humour and drama. Also a rare example of a show with a child I can tolerate, and even like! The kid playing "Gustav"/Brian Jr. is great.