I had been assuming the retailer I used had 30% less market share than it did when Andriasang reported the 2.0m preorder figure, in line with other Dragon Quest performances on DS, but the 2m figure does work if the game is at the next "notch" up (meaning if the store has less market share for DQIX than it did for DQV), for titles with more mass appeal on DS like Tomadatchi DS which is at the exact same market share.
New DQ is probably much bigger than the remakes at "normal" retailers in Japan, so I think the 2m figure is not only possible but realistic. I don't think Square-Enix will ship fewer than 3.0 million copies week one just to be safe.
People are difficult to govern because they have too much knowledge.
When there are more laws, there are more criminals.
- Lao Tzu







