No.
Versus will probably sell like FFX-2 (in relation to X): over a million, possibly the higher end, but it won't pass 2 million without luck and legs. And considering how cheap FFX-2 was to make, that's not really a good thing with lower sales expectations.
FFXIII will probably do somewhere in the high 2 millions/low 3 million. I think that entirely depends on the install base and how many people willing to pick up a PS3 just for FFXIII, and this will effect Versus in that it will msot likely do 50-60% of what FFXIII did.
Either way, there's no chance in hell both combined will 10 million in Japan.
Tag - "No trolling on my watch!"