Since Anet has been silent on this, the only option for Mac users that want to continue playing Guild Wars 2 is to not update to Catalina. I will update anyway, probably after the first x.x.1 update.
Do we know that is the only 32 bit dependency in the 64 bit app? If so does anyone know if there is a workaround? Yes, I think it is the only 32 bit process when GW2 is running.