Conversation so far:
Can you give me a little more information on South America and the Caribbean?
South America has a linguistic diversity rivalled by only a few other places in the world with approximately 350 languages still spoken.
What are some of the languages?
it is not likely that the number of specialists in SA Indian languages will increase fast enough to document most of the surviving SA languages.
What were some of the popular languages being spoken?
many relationships between languages and language families have not been determined.
Did the languages have a positive outlook or outcome?
some of those relationships that have been proposed are on somewhat shaky ground.

Question: What were those languages that did not have a positive outlook?
Self-contained rewrite: What were indigenous languages that did not have a positive outlook in the Americas, South Americas and Caribbean?