Trailers and commercials that run during the Super Bowl are all of the talk around the water cooler the day after, yeah, but a trailer being debuted on GMA Monday morning is a lot different. It's not just because only a small fraction of the people watching the Super Bowl will watch ABC's morning show, but also because even those that do are very likely to miss it, anyways. Most people are getting ready in the morning, especially during commercial breaks (which they don't stop what they're doing to pay attention to, like they do during the Super Bowl), and then leave the house at around 7:30, only half an hour into GMA. That's liable to add up to few people having seen it by the time that they get to work. Having everyone talk about the Super Bowl and its commercials might spark conversation about the Star Wars trailer, so that'll help, but it won't be like if the trailer ran during the Super Bowl.
Sometimes, I feel like I'm the only one who greatly prefers the Winter Olympics /shrug.