Sign languages of Papua New Guinea (PNG) are currently underreported and underdocumented. Yet, like many spoken languages of this region, these languages are highly likely to be endangered. Here, I present findings from ongoing work with a small and endangered sign language of the highlands of PNG, Sinasina Sign Language (SSSL). Our attempts to apply existing frameworks for assessing vitality for this language uncovered issues related to (i) language endangerment evaluations as imprecise predictors of language loss; and (ii) changing attitudes towards deafness and sign language use within the Kere community where SSSL is used. This paper addresses these attitudes, possibilities for the vitality of this language if at least one deaf Kere child is born soon, and implications for evaluating language endangerment globally. Recommendations for adjustments to existing frameworks are also recommended to better address diverse language situations by overtly including potential for new users and likelihood of language shift. I conclude by addressing implications for the goals of evaluating endangerment and by arguing that endangerment situations should not be viewed as static; they are constantly changing as language users and circumstances change, often in unpredictable ways.