I have not
following this thread closely but this caught my eye.
 In support of the answer, I note that LaTeX source is the preferred
 submission format for every math, computer science, physics, and
 chemistry journal that I know of.  It is also extensively used by
 publishing houses such as Springer, CUP, and OUP.   I cannot speak for
 humanities. 
 Hmmm...lets see:
 For the Springer site, I notice that the instructions for submission
 in Word are listed first and the default when the page opens.
 For the Oxford site, I quote "Authors should submit Word or rich-text
 files by the journal?s preferred method. TeX and LaTeX files are also
 acceptable."
 For the Cambridge site, both Tex and Word are given equal preference. 
 
That's progress! And I bet the math looks better than ever (not that TeX
is just about math; I typeset and imposed a 400 page novel with it; not
to mention the galleys for a weekly newspaper for a few years).
--T