Absolutely impossible.
People are overestimating the possible sales of Dragon Quest IX. It is true that NDS install base is a lot bigger than PSX or PS2 but at certain quantity this factor becomes irrelevant because the key factor is the fanbase. Let's take a look at Final Fantasy X sales, with a much lower install base it outsells Final Fantasy XII, the same with other chapters.
Anyway it will probably become the best selling title, but we cannot expect over 3 million units in its first week, actually two days because the game is released on Saturday.







