interesting set of theories but actually from a real world point of view, the universe isnt gonna collide with itself becuase that would imply that there is another area of "spherical space" that all the matter and energy in our universe is trapped in...which there isnt. i know its tempting to look at it like that tho...say for example, if you sail from australia going west eventually you'll start end up where you started but approach from the east thats a simplistic view of course ut we shouldnt think that way.
leading scientists approximate that the universe is expanding at a million miles per hour in all directions. that's something reminiscent of an explosion, hence the big bang thoery. they also hypothesize that once all that matter reach a breaking point its not gonna dissipate an fade away( energy cant be destroyed and all that), but rather its gonna coalsece, and fall back inward on it self.
meaning that since all stars have a shelf life, and they all have to go nova one day all that energy of all the stars whenever they feel like burning out will cuase the universe to implode on itslef, and all that energy is gonna collect to a singularity, and theoretically cuase another big bang and create another universe.
so this crunch thing is cool for marvel for the time being, i like this idea better the negative zone being our mirror opposite and the more we expand the more thier "space" decreases rather than just another dimension occupying the same space but just vibrating at different frequencies. DC pretty much wrote the book on that bullshit already, even though the Ultimate UNiverse depicts the multiverse being younger universes stacked a top older ones as thier ages progresses and thats cool too, but i wanna see how far marvel takes this new idea tho, if and how the PF and the power primordial is gonna get thrown out of the window