What are the chances of wait list getting converted in admit for ESSEC Global MBA?

For all intents and purposes, there's probably a 50/50 chance of converting from a waitlist at any school. There are so many variables, including the quality of your application, the quality of the others in your round, not to mention who else will or is thinking about applying in the next round.

What does your profile look like (in terms of GMAT score, work experience, educational history?) If we know how it stacks up to the averages, maybe somebody will offer more specific advice.