Should the education sector encourage vet trainers, university lecturers, and tutors to pursue TESOL qualifications or professional development?

Group of nine diverse people smiling and posing for a photo in a room, some making peace signs.

For many years, international students have been a staple in our schools, colleges, and universities, bringing with them a wealth of cultural diversity (and delicious-smelling food). However, their presence also introduces some challenges, particularly when it comes to supporting students who may not have English as their first language.   
This is where a TESOL (Teaching English to Speakers of Other Languages) qualification or at least a formal Professional Development course can be incredibly valuable to help the non-ELT educator.
So, what do you think? Should VET trainers, university lecturers, and tutors undertake a TESOL qualification or at least attend Professional Development on TESOL methodologies and strategies?