The Experiment in Vaults 31, 32 and 33

Am I the only person who thinks that Bud's little selective breeding experiment has already failed? What with everyone in Vault 32 wiping themselves out, and a large percentage in Vault 33 killed by raiders, I don't think there's a big enough breeding pool left to maintain genetic diversity. In fact, if they stay in their vaults I can see the entire population dying out within a generation or three.

(Of course Norm and Lucy, and before them, Rose, have displayed the sort of initiative not expected of middle managers. Could it be that Bud has accidentally bred a different animal entirely?)