Waders, if not thrown in mixed aviaries, breed well, which is surprising considering their specialized lifestyle (feeding, migrations etc). They do well in private breeders and research institutions. I remember a research study which bred large numbers of Ruffs in aviaries to investigate genetics of male plumage.
For spoon-billed sandpiper, however, decisive will be protecting their few remaining passage and wintering grounds - almost all tidal mudflats in whole of East Asia were developed or disturbed.
BTW, incredibly cute bird when seen closely - almost like baby emperor penguin.