Please be warned that spoilers are contained herein!
First off, I saw Ant-Man last night and I enjoyed it a lot! I place it smack dab in the middle of my own personal ranking of MCU films in order of favorites--and that's not bad at all considering how outstanding the films are that I rank above it. (I have my own reasons for liking any film, so it is just my own personal list to begin with.)
I enjoy MCU's origin stories best of all (e.g., Captain America: The First Avenger, Iron Man, Thor, The Avengers--i.e., story of the team first coming together--and similarly, Guardians of the Galaxy), since they focus more on what makes characters tick. So this film did not disappoint in any way--in fact it exceeded my expectations. Ant-Man is a well told, well acted, and engaging story. I take my hat off to the writers and directors of this film for taking the hugely offbeat superpowers of Ant-Man and balancing a comedic and serious approach to the character's shrinking ability (as well as telepathy with and control of ants).
Anyway, the point of this article is to consider the implications of Ant-Man's ability to shrink down to the quantum level. I will admit that I don't know a lot about this aspect of the character, and my sources for it are this wiki and this one (the latter apparently centered more around the MCU than comic book sources) which both look pretty well researched. Fans with more comic book knowledge than I can comment on that question.
But at the end of the day, MCU is being selective about which version of the comic books source it draws from (it pretty much has to be, as DCEU does as well in its own right)--and it is changing the comic book source material. For example, in the comic books it is Hank Pym who created Ultron, not Tony Stark. So whether we like it or not, the MCU has its own unique structure and history to its universe in addition to the various versions in the comic books.
So... Ant-Man has the ability to shrink down beyond the atomic level. He can enter the quantum level of space-time. There he will evidently discover a wildly fantastic array of realms embedded within (or at least accessible at) the finest levels of the fabric of space-time.
This obviously has very great cross-over implications for the MCU. Ant-Man could presumably travel to Asgard and its associated realms. The MCU's depiction of Asgard seems to be a blend of science fiction and magic.
And of course Thanos has his quest to assemble the Infinity Stones, which undoubtedly has him traveling across various dimensions of space-time.
And we will surely see in Dr. Strange that he routinely travels to different dimensions which may also be accessible to Ant-Man through his subatomic shrinking ability. He is of course a spellcaster who practices the sorcerous arts loosely based on Tibetan mysticism.
Although not part of the MCU, the 2005 film Elektra featured what could be explained "scientifically" (in the fictional world) as a similar shamanistic or sorcery based intersection of alternate reality dimensions that can bleed into our world.
And if Marvel eventually works out a deal with Fox to crossover with The Fantastic Four (or eventually reacquires the franchise), the new Fantastic Four reboot is clearly headed in this direction as well regarding inter-dimensional travel in which wildly fantastic things can enter our three dimensional, everyday reality, and vice versa.
The Fantastic Four's nemesis Dr. Doom is a sorcerer as well as a scientist, and he will perhaps merge the two by means of accessing other dimensions in parallel realities. Given that Victor Domashev, as he will be named in the reboot, will be based on the Ultimate Fantastic Four comic book series, I think we can expect him to be a sorcerer as the original Gypsy Dr. Doom was; although it seems that in the Ultimate Fantastic Four his occult powers will trace to the black arts presumably practiced by his direct ancestor Vlad Tepes, aka Vlad the Impaler.
So anyway, the implications of the ability to shrink to the quantum level--and thereby gain access to alternate dimensions of reality that are normally partitioned from ours as parallel--would seem to be a major ability of Ant-Man. The question I have is will that also serve as a crossover to magic?
Do you agree? If not, why not? If so, how do you think it might end up being used as the MCU develops its story-lines? What are your speculations? How would you like to see this power used to further develop the MCU?