Terminator opens in Aug 23 then M:I on September 8, then it will have to compete with both Minions and PIxels just 5 days after that. Inside Out, Fantastic Four and Ant-man will also be released but no dates have been finalized yet but I'm guessing it's also going to be September for at least two of those as I assume more big movies will be releasing in the upcoming months.

Terminator won't hurt M:I much, especially not when it's launching two weeks before. Pixels won't hurt M:I much either, and Minions targets a completely different audience, as does Inside Out. Marvel won't release both Fant4stic and Ant-Man close, so the only thing that will hurt M:I notably is Ant-Man, and to a lesser degree Terminator, and to an even lesser degree, Pixels. I still think it can be up in China about 50 million, compared to the last entry's 100. Then it needs to be up 250 million in the rest of the world to gross a billion. It'll be difficult, but it has a shot.

Marvel doesn't decide when F4 will be released, Fox will. So if they decide to release it the same day as Ant-man even then they could. Minions has a different target audience but it is a movie all the same and if people decide to watch it over M:I then they will. Besides Kids can't go to the movies alone, the parents will have to be with them which is the target audience of M:I, and not so much the teens. Not to mention teens are also the target of Minions. Inside Out is also a great threat if it does end up showing in September since the movie is not just a kids movie, it's a family movie targeed at all ages. 

With that, I just can't see it grossing a billion. It would only do so if it somehow reaches 300m to 400m domestically which is going to be very, very hard with it's projected 40-60m opening.

MI: Rouge Nation could have did a lot better on its opening weekend domestically it might not even out gross The SpongeBob Movie: Sponge Out of Water on its opening weekend.

Wtf is that Mission Impossible opening? Disappointing.

I saw 56 million domestically which seems in line with expectations.I miss something?

It was more of a joke, but the fanboy in me wanted a Skyfall-esque opening ( ~$88M ) after Ghost Protocol increased to over $209M dom. 4 years ago.

MI4 was all legs, so this weekend will be the true test for MI5. How much will it drop?

MI5 is estimated to drop 50% on its 2nd week. In Japan Jurassic World is devouring everything, and its against a lot of competition with Minions, AoT, MI5 and the latest and final Naruto movie all becoming dinner for Rexy lol and is projected to top a record weekend in Japan. With one of the biggest weekends coming next week(Obon Weekend) and not one wide opener to be released until the end of August, this will prove to be yet another breakout for JW.