I think standardizing scientific terms and the like is a very minor concern when it comes to preserving endangered languages. Most science is done in English anyways, and that's unlikely to change.
I think that depends, many sufficiently large regions do STEM in regional languages. English is just a language for trade - where there are no need for international communication, there can be little reasons to fall back to English.
I think that depends, many sufficiently large regions do STEM in regional languages. English is just a language for trade - where there are no need for international communication, there can be little reasons to fall back to English.