If I were to hazard a guess, probably around 80-100k.
From what I heard folks were turned off from the originals grimoire system too so could be why people were fence sitting till they heard what early adopters had to say. Though the 2nd game did seem to get more positive responses. At the same time others said they had burned out trying to get the best stones and whatnots. But overall the system was much better.
Mix of characters was amusing this time around too and the event scenes were nicely done.
Considering that Atlus is under new investors now who are not in great financial standings themselves does matter unfortunately. So when an IP does not do as well as expected, focus will be either shifted or shelved. Since the Untold series most def has got to cost more due to the voice acting and the work done with having the story and classic mode it cant be a positive thing on financial report to look at if it did perform under expectations. When I say shelved I mean the Untold versions of the game. Which would be a shame since the 2nd one is far better than the first, which means the team did take a lot of feedback obtained from the first title seriously.
Thankfully Mystery Dungeon seemed to do better than expected and there still is EOV to see just how much attachment is still with the series. So will have to see how that plays out.
The DLC isnt going to be dropped as its the new "In" thing for Atlus to do. Basically started off with SMTIV and I would imagine since it was profitable regardless of the outcry on the internet it worked as a business model which is why they have been doing it constantly now.