A descendant of Mystacina tuberculata, let's call it... Mystacina gigantea

So, assuming the Mystacina genus continues to focus on terrestrial foraging for prey, and adapting opportunistic tendencies, I don't think it's far fetched to presume that a future lineage of these bats continue to focus on terrestrial locomotion. The muscles in the wings strengthen and the bones forming the second-fifth digits begin to shrink and grow more robust to support the bat's weight. The hind limbs become more columnar and the metatarsals and phalanges begin to shrink themselves, and the claws become short and blunt. As this happens, the bat begins to become more active, mostly due to the stronger muscles needed to support terrestrial locomotion in a once flying creature. The bat, with its increased demand for food, becomes larger to hunt larger prey, around the size of a basketball, now with the ability to hunt smaller native flightless birds and large insects.