Either Captain America or Rogue One. The only other movie that can come close is X-Men. Both Independence Day and SvB won't be huge juggernauts.
I feel like Cap 3 will be the biggest breadwinner of that group, with SvB coming in second. Independence Day won't be huge, IMO. I'm betting it's bit of a letdown. If Will Smith were back in it, I'd say it could have been a huge smash, maybe not Jurassic World numbers, but probably biggest of the year. But without him, it feels like just another cash grab.
I'm super curious to see how Rogue One does. That's a Star Wars movie without Han, Luke, Leia. I'm betting it tops out at 200 domestic.
overall though, I think we're gonna see box office numbers way down from this year, likely on par with last year. And the biggest movie of the year probably ends up being Finding Dory. But 2017 will be massive - Star Wars 8, Avatar 2, Justice League, Guardians 2, Furious 8, Despicable Me 3... all those movies will be monstrous smashes.