It really depends. For comparison, when the Wii launched strong in Japan, it had the potential to get to 20 million there at least. Then the devs did the unthinkable, they put major franchises exclusively on the 360. Killed any momentum the Wii had in the day. Between that stupidity and devs putting major titles on the DS, put console gaming in a poor position. Japanese devs have already started to pour resources into the PS4 early, so that's one problem solved. Not much they can do with the other problem. Best thing is to hope that Dragon Quest 11 does indeed go to the PS4 and move hardware and Final Fantasy XIV rebuilds customer faith in the product. Between those and more titles in the pipeline, I can see the PS4 reaching 10 million plus. That's really it though :/
