Has there been a study on trailer views vs BO gross? We could draw parallels to things such as Miley Cyrus' Wrecking Ball or Psy's Gangnam Style. Yeah, they're doing OK but outside of YouTube records are they breaking down doors and taking names?
Trailer views don't really line up with grosses very well. Fifty Shades of Grey had nearly 70M trailer views while the most viewed Big Hero 6 trailer had 15M views. Big Hero 6 grossed more domestically and overseas.
While I think that Star Wars will at least win domestically this year, the trailer count is not the best measure of that.
Age of Ultron is a sequel to a movie that came out 3 years ago and is part of a series that has already seen 10 films in the past 7 years. People know what they are getting.
Star Wars is the first film in its franchise in a decade, and the first with the original cast in over 30 years. Star Wars also has the male equivalent of the hardcore Twilight fanbase, who are obsessing over every detail of those trailers. I don't really think the MCU has that to even a fraction of the same level. People like the films, but they are not declaring "super soldier" on their census forms.