7 million would be quite a step up for this series. Probably VII or VIII would be the previous tops. VIII came in at just under 5 million, and VII was probably in the same territory. For 7 million to happen the series would basically need to keep doing ~4 million (or more) in Japan, while also exploding in the west.
I don't have the numbers by me to check on this, but I doubt the western releases of Rocket Slime, Monsters Joker, IV, and V combined have come anywhere near multiple millions.
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I don't have the numbers by me to check on this, but I doubt the western releases of Rocket Slime, Monsters Joker, IV, and V combined have come anywhere near multiple millions.