I'm pretty sure the maximum seat capacity should be 180. This will reduce some of the edge A320-200s have over 737-800s (but it would cause disruption to running worlds).
Edit: It is currently 189, same as 737-800. Even LCCs like HK Express (with 28-30" pitch) have 180 seats on it: https://www.seatguru...Airbus_A320.php. I am not talking about the A320neo.