If you were thinking of becoming a CELTA trainer for example, then this is what Cambridge ESOL states:-

"Potential CELTA trainers are required to have the Cambridge ESOL Delta or an equivalent ELT qualification. Prospective trainers with solely a strong academic background may not be suitable as CELTA trainers because of the required focus on practical classroom issues. An MA in ELT with a strong practical focus may be acceptable if the following four conditions are also met. The prospective trainer:
• has substantial (normally five years), recent and varied ELT experience
• is familiar with the types of classes trainee teachers will teach
• is familiar with the materials trainee teachers will use
• can demonstrate professional involvement in ELT.”

@ CL:

I don't mean to take anything away from this discussion, I am enjoying it immensely, could you please email me more about the CELTA, I am interested, email is included.

Cheers
SMGS