Technically with event rates, you can get 4k dumplings on passive regeneration alone. Thou you need to get at least a bit of luck in bonus map spawns in phase two, ans burn stamina from day 1 of the event. So with few gathers you can do it even if you started late.
For me non-paying player, that doesn't pay much attention to "original" on DMM. I can only believe people that out Nutaku version is worse.
I don't think they will change anything, and with the % drop chance in infos even if drop chance for event girls is double the normal, I would probably still not get a 6*, as I barely get any 5*.