I think this is way too soon.
In general, I don't like the idea of turning a tragic event that touched the lives of thousands of people into a movie. I especially don't like it when it's been less than five years. I wasn't at the finish line or anywhere near where the bombs went off, but I can remember that day, and the days that followed, quite clearly. It's not a positive memory, to say the least.
Maybe this might seem silly, but I am actually kind of disgusted by the thought of this event being turned into a movie, especially such a bald-faced "awards vehicle" for Mark Wahlberg.
We don't need to visualize this event as a story about a Wahlberg character in order to process it. This was a real thing that happened to real people. Let's let that sit a while before we imagine it on the big screen, huh?