who knows, it is hard to tell. Dragon Quest is not in the same position as Monster Hunter because of several things:
1. Monster Hunter had already an HD version, the portable 3rd HD for PS3.
2. It is a port of Monster Hunter Tri and 3G. I know there are some differences.
3. A completely new Monster Hunter 4 is just around the corner for a handheld with online connectivity for the first time.
It may not sell that well, but expect the next if built from ground up for Wii U to sell like it should.