Getting adult zebras to breed can be a real hit or miss proposition. The biggest hurdle is getting them started. Many breeders rely on ro water and TDS meters. They will put the fush trhrough a dry and then a rainy season in order to get them spawning. Sometimes this works, and sometimes it doesn't.
While all it takes to spawn is a pair, having one doesn't mean they will. Breeders tend to rely on a colony which contains more females than males.
Even if you get eggs that hatch, spawns are small and between the average 12 or so eggs to the point they are "sellable" takes some time. Zebra fry are not easy to raise either, so that is the final challange.
That all said, there is nothing cuter than a zebra fry and I urge anyone who can afford to have these fish try to spawn them as there is no telling how long they will be around in the wild.