We tend to see these programs mainly as insurance against what we would term catastrophic loss in the wild. In other words,if for some reason all the tigers disappear then we've got some kind of backup. We're linked with a range of zoos here in Australia in what we term a regional program which in turn is linked with other regional programs. North America, Europe and some Zoos in South East Asia. For some of the tiger sub species I'm sure it's not.
Tigers are overall secure in captivity.
It may well be that within our life times the only place you can see a tiger is in a zoo.