Yes, there has been some suggestion in the past that certain species, for example lions, produce more offspring in unstimulating conditions. It is likely that certain species will be more prolific if other stimuli are removed or the possiblility to order themselves socially as they might in the wild is absent. However, the resulting offspring will degenerate in terms of their repertoire of social behaviour, in a cramped or barren space, and will often learn to negotiate situations differently as a result, or fail to do so at all. Yes, the idea of literally farming huge numbers of endangered species is appealing, and works in some cases (eg. Crocodilians) but I think there is a great behavioural cost to doing so with animals that experience a significant period of neonatal development. I could be totally wrong though, it would be interesting to see data on the primates born at lezpig in those conditions, whether they go on to socialise well at other zoos, are good parents etc. Even so breeding is really not always good indicator of social/mental/physical health of captive animals.