Toy Story is an animated franchise geared mainly towards kids. Toy Story 3 represented pretty much the gross potential of that "Genre" out side of Shrek. Couldn't care less for what toy story did, it doesn't represent the potential of the demographic in question here. Instead, try looking at what this "genre" can do relative to it's appeal, for example those iron man films.
Do Black men in barber shops talk about toy story? Cause they were talking about both Ironman and MoS last week when I stopped by
Secondly, name 2 or more films that have opened in june, in which all things being equal, would have made a boat load more money had they opened up during may or whatever. Green Lantern and the majority of recent june releases made as much as they made inspite of their dates. XFC was coming off of a truly hated string of films(the type of hate people think Transformers gets but doesn't). Speaking of which, films that have made money in june dates is Transformers and as we all know, Paramount diffuses those openings over a week.
All in all, june isn't the same as late august or early september, where there are real objective quantifiable reasons for diminished returns(such as holiday camping and school). MoS has as good a shot as any film, perhaps even moreso cause school is out but kids still have those bonds of communication for buzz.
What's more, june(AS WE HAVE SEEN THIS VERY YEAR) is usually littered with bombs or disappointments, if MoS isn't one of those, it should be clear skies a head.
Time will well.
psst, sequel's already been green lit.