Update of "Linguistically Homogeneous vs Heterogenous Polities"?

[Don Osborn]

Is there any retake or update on Joshua Fishman's (classic?) article
comparing/contrasting linguistically homogeneous and heterogeneous
countries? I apologize for the broad and ill-informed question. There does
however seem to be an actively ongoing set of assumptions on many levels
(development experts, government officials, etc.) in many parts of the world
that many languages in a society is the source of various problems, not the
least of which is a low level of or potential for economic development.

Thanks in advance for any feedback.

Don Osborn

Fishman, Joshua A. 1968. "Some Contrasts Between Linguistically Homogeneous
and Linguistically Heterogeneous Polities." In Joshua A. Fishman, et al,
eds. _Language Problems of Developing Nations_. New York: John Wiley & Sons.
Pp.  53-68.