"Plummeting off to his death?" Hardly! Something as big as a squirrel can fall x-number of miles and survive handily. They don't build up enough momentum to kill them. Ants simply "float" (or fall slowly) until they reach the ground. "Ant Man" (should be "Woman", really) would be able to catch rides with web trailing spiders, who use wind to pull themselves for miles through the air. Trouble is, travel would be very, very slow, and capricious.
Ants are the most warlike and vicious killers on the planet. In the words of Hölldobler and Wilson: "If ants possessed nuclear weapons, they would destroy the planet within a week." Compared to ant warfare, we are a benign species.
That's why "Phase IV" has no sequel: it would be boring, as ants take over each human and manipulate the "giants" by possessing their brains.
There are nearly 10K identified ant species. And collectively, the total weight of ants is c. the same as that of all humans. Each human weighs c. as much as a million ants.
The smallest ants can fit a colony inside the head of the largest ants. Some species are so diverse in the sizes of their workers that the smallest workers (operating inside the "nursery") are five hundred times smaller than their giant warrior sisters, yet belong to the same species.
Some ants subsist entirely on the "honey dew" of their "cattle", herds of aphids. "Honey dew" is a sweet tasting poop, btw. (Bees lick this off the surfaces of stems and leaves, so what we get with our "clover honey" is far more than just nectar!)
Some hordes of ants are so rapacious that it is recorded that untended human infants have been swarmed and snipped to death, literally covered in writhing blankets of ravening ants! When such species go on the rampage, as is their wont, all animal life in the threatened area gets the heck out of "Dodge" as quickly as possible. Those not swift/early enough are eaten. (The sped up scenes in Phase IV of ants swarming over victims and literally stripping them to the bones are not fiction!)
Some ant raids concentrate on genocide and break into the "nursery" chambers and carry off the pupae and larvae back to their own nests, where the captives are raised as members of the raider colony, even though of a different species. The captives adopt the scent of their masters.
One species of ant has the swiftest moving animal action recorded by high speed film. The ants advance with their mandibles open a full 180 degrees. Tiny hairs inside the opened jaws are stimulated by prey and the jaws close so quickly that only "springtails" (their favorite insect prey) have any chance at all of escaping. Hölldobler and Wilson give the comparison that if the ant were the size of a human, the closing speed of its jaws would be faster than a rifle bullet.
"Ant Man" will possibly stimulate interest in real ants. Which, as the old saying goes, are "stranger than fiction"….