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A roadrunner top speed is about 18 mph. (I have chased many of them on foot, in my youth). When pressed by a predator, they can fly, as well.
Kiwi tops at an estimated 13 mph, and can't fly at all.
They defend against other Kiwi birds - not bobcats, foxes, dingos, coyotes, lynxes, ocelots, wolves, eagles, etc., who would easily take them.
If they were as prolific, and could fly just enough to get high enough to escape ground predators pursuing them, like a chicken can, I'd say "they'll do fine".
That is not the case, however. It will be a big struggle for them to stay alive, in the wild as new predators move into their habitat. imo
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