I almost titled this thread, Molly Huddle should run the OT marathon, because I kind of think she should. But obviously she has a financial incentive to delay her debut until after the Olympics, when she can get a big check from NYRR to run NYC. It doesn't sound like she's even considering the marathon trials.
http://www.ctollerun.com/episode.php?e=248
But let's talk about why she should. She could beat Shalane, which would mean she's as much a medal contender if not more of one. She clearly excels on the roads, probably more so than she does on the track. And she's already 31, which is how old Shalane was when she moved up to the marathon at the Olympics. By the 2020 Olympics, she'll be older than Shalane is now.
She could be a killer marathoner. Why not at least see and have a chance to run it at the Olympics if it looks like her best shot at a medal?