The range for the Inazuma sell-through is a bit schizophrenic. 20% really wouldn't be so hot, whereas 30% could be pretty okay for the type of game it is.
If the game sold 25% of the first shipment at day 1, it could easily sell 50% on first week. doing so it will probably have no issue is selling it's entire first shipment once everything will be said and done.
If we want to discuss the fact that they are no longer capable of repeating the Ds crazy numbers, we should also consider who (or which franchise) will be able to do so.
Let's see which will be the Ltd numbers after the holidays for Layton Vs Aa and for this one. I think that 250k and 400k could be lower than the golden age of Layton and Inazuma games, but still positive results