In Iceland, rather than letting the English word 'computer' catch on, a linguist combined an old word for a witch (völva) with the word for number (tala) to come up with 'tölva' which is now the word for computer. Today, engineers often come up with clever new words for technical concepts.
With a proactive approach even declining languages can be revived (eg. Basque or Gaelic in Ireland).
Small tribes unfortunately lack the impetus or resources to proactively maintain their languages in this way.