The following information from the UNESCO Intangible Cultural Heritage website is relevant for most of the Chadic languages we are dealing with:
Half of the 6,700 languages spoken today are in danger of disappearing before the century ends, a process that can be slowed only if urgent action is taken by governments and speaker communities.
The UNESCO Interactive Atlas of the World’s Languages in Danger, freely available, aims to provide speaker communities, policy-makers and the general public with state-of-the-art knowledge, continually updated by a growing network of experts and community members.
The online edition of the Atlas includes all of the information in the print edition (soon to be released) and much more.
More information in English, French and Spanish can be found here:
Chadic Newsletter Online 