The answer to this question lies in one's definitions of survival and people. If survival means a thriving culture with the passing on of traditions to the next generation, then most definitely the language is key to the culture's longevity. If however, the meaning of survival is the bare minimum of remembrance and practice, perhaps memories in a journal and documents of family history than the resurrection of the Wampanoag language is not critical as the bare minimum of memories could be recorded in English.
Do the genetics of the Wampanoag define them as a people or do there practices and culture set them apart?
Both are import as the