I mean, I wouldn't be surprised at all if it underperformed to some degree. Not because there's no audience for DQ on Nintendo platforms, the 3DS release did great. It's just that t's more than two years late. Should still do well, but any comparisons to the PS4 release will need to be done with the extenuating circumstances in mind.
What would underperforming look like in terms of sales numbers? Considering it has sold to both the PS4 and 3DS previously, what would be "on par" or "below par" or "above par"?