That hypothesis isn't new. In the 1960s there was supposedly some evidence, including a picture, that had her in the Marshalls. It was refuted effectively back then, notably how far off course she would have had to have been from early in the flight. However, the position reports and witnesses of her flying over during the earlier parts of her flights had her on course for Howland.
Hi Rick - i'm not fully conversant with the position reports that were made on route, but from the incredibly repetitive show last evening it appeared to me that the last position report was many hours prior to when they should have arrived at the destination. At least, that was a position report that was made by visual means and not through either dead reckoning or by other onboard but non-visual techniques. The conjecture about how the Plan B was to fly due West after not finding Howland and hopefully making landfall on a north-South chain of atolls was interesting.