I would say 'yes', your experience as a teacher would be more than fine.
Just a few things to bear in mind. If you continue teaching and apply for a job in the future, the difference between you and other candidates may come down to who has a cert. It's something that could happen. Some employers also ask their admin staff to filter out the hundreds of CVs they receive, so if the admin staff are asked to throw away those that don't have a teaching certificate, you may be out of luck on those occasions (even though you have the experience of teaching).
Also, you can argue for a better salary with a cert? It's like people who have degrees (in hong kong) can argue for a better salary than those without.
However, there are a vast amount of TEFL jobs in Asia so I'm sure you'll be employable if you decided to leave your current role.