Yes but its all about the money. They would make a "Sturgeon Falls" for their second season with the main detectives again and with the kid being a murderer and the main detective solving the unsolved case he had from his case before Grace point. Also would show the relationship with his daughter and such. They started setting it up in the final episodes.
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http://www.zap2it.com/blogs/gracepoint_showrunner_defends_killer_revea l_shares_season_2_plans-2014-12
Are you still talking about a Season 2 or is this a self-contained story?
It was not meant to be self-contained and we have a lot of ideas and a lot of excitement about where it could go. It remains to be seen whether we'll get a chance to actually do that. It doesn't seem terribly likely at the moment.
HitFix: To some degree is there almost more excitement for you guys in the prospect of a second season where you wouldn't have "Broadchurch" looming over your shoulder at all times?
Dan Futterman: Absolutely. It was always the plan and it felt like a great experiment to us, that you start in the same place and you diverge to a certain point by the end. To me, what a thrilling thing it would be to then have two shows running concurrently that are on very different tracks. I've never seen that before. That felt like it would be a great experiment. People could compare and contrast, decide which one they liked more. That possibility is inevitable and that would be fine. So yeah, there would be some relief in that and there would be some, I think, excitement on both sides of this.
Read more at http://www.hitfix.com/the-fien-print/post-mortem-co-showrunner-dan-futterman-weighs-in-on-the-gracepoint-killer-reveal#LYPjWbeujlho7xZV.99